Hi!
First, what is class 2 and class 6? Which is the best 2 or 6 in this case?
And which one of these two is the best:
Nokia MU 43 8 Gb MicroSDHC-11
or
Transcend microSDHC 8GB (Class 2) (TS8GUSDHC2)
- Class 2 specifikation - Support för Error Correcting Code (ECC)
Class mainly refers to read/write speed of the SD Card, the better the class the faster will be the data transfer speed but be careful with class 6 or class 8 cards on higher end memory like 8GB, 16GB or 32GB that has more tendency to give error. Class 4 is your best bet.
yusufjee said:
Class mainly refers to read/write speed of the SD Card, the better the class the faster will be the data transfer speed but be careful with class 6 or class 8 cards on higher end memory like 8GB, 16GB or 32GB that has more tendency to give error. Class 4 is your best bet.
Click to expand...
Click to collapse
Hi! And thanks!
I did go with the:
Kingston Micro SDHC Kort (TransFlash) - 8GB...
Kingston kort (TransFlash) - 8GB Class 4 - inkl. adapter. - SDHC kompatibel - Read-/write hastighet 58x (8,8 MB / s) / 45X (6,5 MB / s)
Hope this is better than the one i had, did not know about classes at all.
if you are installing and running thing of the SD always go for the higher class card.
I have a class 6, 16GB SanDisk which I have had since they
were first available.
I have had no problems with it from day 1.
tkalli said:
I have a class 6, 16GB SanDisk which I have had since they
were first available.
I have had no problems with it from day 1.
Click to expand...
Click to collapse
I cannot find a 16gb sandisk class 6 anywhere. I can't even find a class 6 microsd sandisk period. Where did you find it?
jas0nw0ng said:
I cannot find a 16gb sandisk class 6 anywhere. I can't even find a class 6 microsd sandisk period. Where did you find it?
Click to expand...
Click to collapse
Sorry, it is a Transcend 16GB Class 6.
The Sandisk 16GB in other phone is a class 2.
I just bought a kingston 32gb class 6 micro sdhc but when ever i put it in my hd2 it just freezes up and as soon as I remove the card it works fine again.At first i though that it was a fake so I:
1)performed multiple tests,
2)reformated a 1000 times,
3)even putting 20gb of data just to make sure.
Turns out that it is authentic and it works perfectly on my girlfriend's htc BalckStone it also worked when I installed NAND (which i later removed due to insufficient memory).Ive been searching for days, I think its a windows mobile issue, any tips??
you formatted it 1000 times ?
btw i use a class 4 8gb and no problem except it sometime cannot boot android, i dunno if its the sd problem or android problem
I just got a Nook Color and rooted it with Autonooter 3.0
Everything works great. I'm thinking of trying Froyo or Honeycomb on a SD card.
I want to ask which SD card would work best.
Reading through the forums, I have found there are some conflicting information.
On the one hand people recommend Class 6 or higher cards.
On the other hand a number of posters have reported using a class 2 Sandisk card and got good performance.
Since the classification of SD cards only refers to the writing speed, a lower class card may have higher reading speeds than a higher class card. I 'm wondering which is most important for running Froyo/HC on Nook Color, a higher reading speed or a higher writing speed?
For reference here are some benchmarks I found on Amazon.
It appears this Sandisk class 2 card have reading speeds of up to 18MB/s, and writing speeds of up to 6MB/s
[SanDisk 16 GB microSDHC Flash Memory Card SDSDQ-016G (Bulk Packaging)]
This class 6 Transcend card have reading speeds of up to 15MB/s, and writing speeds of up to 11 MB/s.
[Transcend 8 GB microSDHC Class 6 Flash Memory Card TS8GUSDHC6E]
Here's more info for you:
http://forum.xda-developers.com/newreply.php?do=newreply&noquote=1&p=12000938
I have an 8 gig class 6 transcend in my fascinate, and a 16 gig class 6 transcend in my NC running CM7. I have a season of an anime I'm watching with Rockplayer on my morning metro ride. Both transcend cards have been great. I have two 16gb Sandisk class 2 cards. One is my "fast one" that's at least as fast as the transcend cards. One is my "slow one" that is unbearably slow for things like transferring a season of anime for watching later with rockplayer. I also have a 16gb samsung class 2 that has performance that mirrors the "slow" sandisk class 2. If I had to get another card right now, I'd probably get another transcend class 6. I've also heard great things about patriot brand, but I can neither confirm or deny those things from personal experience.
So I finally got HoneyComb working on my Nook Color (NC), residing in the microSD card using a Kingston 8GB Class 4. However, this card seems to be one of the slowest and using the HC in NC is almost unusable.
Example:
- Screen rotation takes 3-5 seconds
- Opening new app, depending on which app, can take 1-5 seconds
- Browsing certain website can make the screen unresponsive
- etc..etc..
I know that the HC version available in this website is probably still in "preview" or beta stage and some slowdown is expected, but I am not expecting it to be THIS bad. So I think the culprit is the microSD card itself.
However, I have tried many different MicroSD card and none works. I.e. it gives the "decrypt storage" error when booting up the NC. The cards I have tried are:
- Patriot 16GB Class 10
- A-Data 16GB Class 10
- Kingston 8GB Class 6
The ONLY one that works so far is Sandisk. Unfortunately, from SanDisk website, I do NOT SEE ANY card higher than Class 4.
Thus, can you recommend which is the MOST STABLE and FASTEST card? I.e. the ones that did NOT give slowdown per the examples I have given above.
i'm using sandisk 4 GB class 4 HC
nookie froyo, runs fantastic.
Class 10 cards apparently dont do too well. lots of people have had issues with those. class 6 should be OK, class 2 and 4 workk very nice.
Do you have recommendation for a good Class 6 MicroSD card? SanDisk don't sell anything higher than Class 4. I tried Kingston Class 6 and my Nook Color just spit on it...
lanwarrior said:
Do you have recommendation for a good Class 6 MicroSD card? SanDisk don't sell anything higher than Class 4. I tried Kingston Class 6 and my Nook Color just spit on it...
Click to expand...
Click to collapse
I am currently running trancend 8gb class 6. Havent had any issues with froyo, HC or Cm7 booting or running.
I'm using a A-Data Class 6 16Gb card with no trouble. I do have 2 Kingston Class 4 32Gb cards and they have the issue with the decrypt garbage when you try to boot up HC from the sdcard. I've also got a Class 10 32Gb Wintec card which I have not had time to test out yet as I just got it the other day.
After a failed Kingston 16gb class 10, I got a SanDisk 8gb Class 4 and it's speedy enough. I notice very minimal slow down on some menus but I don't know if that's just the OS itself (being a preview after all)
danootz said:
After a failed Kingston 16gb class 10, I got a SanDisk 8gb Class 4 and it's speedy enough. I notice very minimal slow down on some menus but I don't know if that's just the OS itself (being a preview after all)
Click to expand...
Click to collapse
That's the exact same card I have, and you did NOT experiences any of the slowness I posted in my 1st thread?
How drastic is the difference between Class 2 and Class 4?
I know that it says that it processes twice as fast, but is it noticeable? Can somebody give an example of when you can actually tell the difference? Playing music, watching movies, booting from microsd?
I have a Sansdisk class 2 8gb card that performs just as well as my class 10 Patriot 8gb (which has booted both HC and currently used as storage for my eMMC CM7 install.)
Sansdisk severely underrates their SD's and many other manufacturers overrate theirs. It is not a perfect rating system.
I would recommend going w/ sansdisk in whatever size you can afford. Class 2/4 will be plenty fast.
Before I switched back to Froyo I was running off the SanDisk 8Gb card from BestBuy - $20 - which I found very responsive. I think it is Class 4, but I could see any label on the card itself or the package.
The SD card speed was not the reason I switched back, it was the lack of other features in HC preview. I can't wait for an AOSP release
8GB Cards
I currently have 2 8GB microsds that I switch between:
-Transcend 8GB Class 6 running Honeycomb from Amazon. Tested it with h2wtest and got 16MB/s write and 14MB/s read. (Not sure if that is a typo on the tool or not and it's supposed to be bits instead of bytes, but that's what it says).
-Sandisk 8GB Class 2 running Nookie Froyo. Tested at 14MB/s write and 18MB/s read.
Both cards run their respective ROMs well, so it seems to jibe with what chisleu said about Sandisk underrating their cards. I could also be limited by the USB adapter I was using, but I had another adapter that was limiting it to 4MB/s both ways.
1/16/2012 update: Thanks to waxhell for compiling all of the results in this thread (at least as of mid-december! OK, so I took a while to get this posted...)
https://docs.google.com/spreadsheet/ccc?key=0AjPE3ZAD2eVudE9vZmQ3aHlfTkFvU2J4ZUplRDJQTEE
5/20 update: SD card performance benchmark table by a.fenderson from later in this thread added at the bottom of this post. Thank you a.fenderson!
------------------
April minor update with a Transcend SD (see http://forum.xda-developers.com/showpost.php?p=12964262&postcount=8)
_________________________________________________
Let me tell you my story.
Over the last couple of months as I have mucked around with SD booting various flavors of froyo and, more recently, CM7, I have found it maddening that there are apparently so many people that LOVE those versions, even people that seemed to have the same SD card as the two I've tried.
One of those is a Class 10 Patriot 8gig, which I've seen mentioned as an acceptable boot disk.
The other is a Kingston Class 4 4gig that tests out as significantly slower than the Patriot, but didn't really run froyo any slower.
Now I know I've seen posts that mention small block write speed as being important, but the numbers I've seen posted really didn't make me think the Patriot was the cause...
...the cause of FRUSTRATINGLY slow UI, where froyo (and CM7) seem to go off into lala-land for a few seconds every time I (tried to) do something.
...the cause of glacial web-surfing, where even downloading GOOGLEforchrissake takes forever. Of snail's-pace market downloads. Oh god.
Every time I would give up and go back to Eclair and breath a sigh of relief, reveling in the snappiness, the zippy web-surfing, the rapid response of m.pornhub.com.
And every time the siren song of the CM7-elite would call me back. THIS time I did something different. I saw mention that a Class 2, YES A FREAKING CLASS 2, Sandisk from costco worked well. So I skippity-skopped up and bought one.
After backing up the Patriot and writing THAT VERY SAME img to the Sandisk (which, yes, took 3 times as long as writing to the Patriot), I booted CM7.
OMG
The heavens opened and the angels sang, I HAD ARRIVED IN THE PROMISED LAND!
NOW I knew what the chosen had been praising! NOW I knew the joy that is CM7! ZIP-ZIP-ZIPPITY!
HOLY CRAP?! How could a benchmark be so misleading? I HATE those bastard SD manufacturers, or maybe it's the industry group that chose such a sucky measure of speed.
For your edification, here are some CrystalDiskMark (5 iterations, 50MB) results from 2 sucky cards and the good Sandisk.
__Test_________________Sandisk 8G Class 2___Patriot 8G Class 10____Kingston Class4 4Gig
Sequential Read :__________10.871 MB/s________20.036 MB/s___________18.700 MB/s
Sequential Write :__________6.659 MB/s________13.660 MB/s____________4.277 MB/s
Random Read 4KB (QD=32) :___3.077 MB/s_________3.444 MB/s____________2.088 MB/s
Random Write 4KB (QD=32) :__1.791 MB/s________0.038 MB/s_____________0.016 MB/s
Look at that, both the Kingston and the Patriot blow away or are close enough to the Sandisk in everything BUT....
(wait for it)....
SMALL BLOCK RANDOM WRITES
where the Sandisk is FIFTY times the speed of the Patriot and ONE HUNDREDtimes the Kingston.
Now you may say, "Swizzlenuts, old pal, I KNEW that."
But for all you poor slobs who didn't, who are dragging yer sorry ass through the broken glass that is booting off of a slow SD (you know who both of you are), I hope this helps.
And now you may commence posting links to specific posts where this info was discussed in detail last December.
------------------
Thanks to all of the people that posted their results and to a.fenderson for compiling them. Here's his table from http://forum.xda-developers.com/showpost.php?p=13991898&postcount=144
Code:
POSTER BRAND CLASS CAPACITY 4 KB RANDOM
(GB) WRITE QD32(MB/s) NOTE
swoozle SanDisk 2 8 1.791 Model: SDSQ-8192-AC11M
a.fenderson SanDisk 4 16 1.660 SanDisk C4 16GB 1 of 2 cards
MickMcGeough SanDisk 4 8 1.59 benchmarked in XBench, QD unknown
a.fenderson SanDisk 4 16 1.500 SanDisk C4 16GB 2 of 2 cards
Awats SanDisk 4 16 1.391 SanDisk C4 16GB 1 of 2 cards ; fastest (onboard) reader
arwild01 SanDisk 4 8 1.369
Awats SanDisk 4 16 1.284 SanDisk C4 16GB 2 of 2 cards ; fastest (onboard) reader
robot8 SanDisk 4 8 1.270 SanDisk C4 8GB 2 of 2 cards
robot8 SanDisk 4 8 1.259 SanDisk C4 8GB 1 of 2 cards
chinly43 SanDisk 4 16 1.257 (not via Nook) ; same card as chinly43's other listed SanDisk C4 16GB
joobu SanDisk 4 4 1.175
angomy Nook internal N/A N/A 1.116 via Nook on USB
chinly43 Nook internal N/A N/A 1.094 via Nook on USB
a.fenderson Transcend 2 32 1.032
a.fenderson SanDisk 4 4 0.898
a.fenderson SanDisk 2 4 0.891
pchoi94 SanDisk 4 16 0.834
chinly43 SanDisk 4 16 0.769 via Nook on USB ; same as chinly43's other listed SanDisk C4 16GB
pryonix SanDisk 4 8 0.625
chinly43 SanDisk 2 8 0.616
a.fenderson SanDisk 4 8 0.596
angomy SanDisk 4 16 0.574
Blue6IX SanDisk 2 16 0.350
a.fenderson SanDisk N/A 2 0.269
Awats SanDisk 4 2 0.261 SanDisk C4 2GB 1 of 2 cards ; fastest (onboard) reader
Awats SanDisk 4 2 0.236 SanDisk C4 2GB 2 of 2 cards ; fastest (onboard) reader
pryonix Samsung N/a 2 0.093
victle Kingston N/A 2 0.051
victle Dane-Elec N/A 2 0.050 0.050 or less: exact value unspecified
joobu Lexar 4 8 0.038
swoozle Patriot 10 8 0.038
Blue6IX Dane-Elec 4 4 0.037 (made in Japan)
omghahalol Transcend 6 16 0.037
Ravynmagi Samsung(??) 2 4 0.037
pryonix Kingmax 10 16 0.036
Ravynmagi Wintech 10 16 0.036
victle Transcend 6 4 0.034
omghahalol Transcend 6 8 0.033
Ravynmagi SanDisk 2 8 0.033
pryonix Transcend 6 8 0.033
Ravynmagi Patriot 10 16 0.030
Blue6IX PNY 10 8 0.030
pchoi94 Kingston 2 16 0.030
swoozle Transcend 6 8 0.029 Model: TS8GUSDHC6
joobu ?? N/A 2 0.029
chinly43 SanDisk N/A 1 0.029
a.fenderson SanDisk N/A 1 0.028
victle PNY 4 8 0.028
Blue6IX PNY N/A 2 0.027 (made in Taiwan)
omghahalol SanDisk 2 2 0.021
MickMcGeough SanDisk 2 8 0.02 benchmarked in XBench, QD unknown
robot8 Transcend 6 8 0.018 Transcend C6 8GB 1 of 2 cards
ExploreMN Patriot 10 16 0.018
arwild01 Samsung(??) 4 8 0.017
swoozle Kingston 4 4 0.016 Model: SDC4/8GB
Awats Patriot 4 4 0.016 Patriot C4 4GB 1 of 2 cards ; fastest (onboard) reader
robot8 Transcend 6 8 0.014 Transcend C6 8GB 2 of 2 cards
Tnexus Patriot 10 16 0.014
a.fenderson Kingston 4 8 0.014
Awats Patriot 4 4 0.011 Patriot C4 4GB 2 of 2 cards ; fastest (onboard) reader
chinly43 Lexar 4 8 0.011
I love the kubrik reference in title.
so my cheapy microcenter 4gb is why my HC preview was just "okay"
Both entertaining and edifying.
Thanks, swoozle! (I mean "swizzlenuts" old pal?)
Now if only that obscure performance metric were easily determined from printed SD card specifications...
Yeah, I have two old 2G uSD (no classified) and both work fine with CM7. The benchmarks are almost as good as the well tested Transcend 4GB class 6, random write speed beat the Transcend, but random read is little bit slower
My Kingmax card works butter smooth with CM7......but always hangs up on nookie froyo....
So, I am gonna buy sandisk now
I experienced the same thing
All my so call fast cards (class 6 and class 10) worked very slow or had boot problems. After switching the to the Costco Sandisk class 4 card, I was able to use CM7, HD, and all the other images with good preformance from the SD card.
swoozle said:
Let me tell you my story.
Over the last couple of months as I have mucked around with SD booting various flavors of froyo and, more recently, CM7, I have found it maddening that there are apparently so many people that LOVE those versions, even people that seemed to have the same SD card as the two I've tried.
One of those is a Class 10 Patriot 8gig, which I've seen mentioned as an acceptable boot disk.
The other is a Kingston Class 4 4gig that tests out as significantly slower than the Patriot, but didn't really run froyo any slower.
Now I know I've seen posts that mention small block write speed as being important, but the numbers I've seen posted really didn't make me think the Patriot was the cause...
...the cause of FRUSTRATINGLY slow UI, where froyo (and CM7) seem to go off into lala-land for a few seconds every time I (tried to) do something.
...the cause of glacial web-surfing, where even downloading GOOGLEforchrissake takes forever. Of snail's-pace market downloads. Oh god.
Every time I would give up and go back to Eclair and breath a sigh of relief, reveling in the snappiness, the zippy web-surfing, the rapid response of m.pornhub.com.
And every time the siren song of the CM7-elite would call me back. THIS time I did something different. I saw mention that a Class 2, YES A FREAKING CLASS 2, Sandisk from costco worked well. So I skippity-skopped up and bought one.
After backing up the Patriot and writing THAT VERY SAME img to the Sandisk (which, yes, took 3 times as long as writing to the Patriot), I booted CM7.
O
M
G
The heavens opened and the angels sang, I HAD ARRIVED IN THE PROMISED LAND!
NOW I knew what the chosen had been praising! NOW I knew the joy that is CM7! ZIP-ZIP-ZIPPITY!
HOLY CRAP?! How could a benchmark be so misleading? I HATE those bastard SD manufacturers, or maybe it's the industry group that chose such a sucky measure of speed.
For your edification, here are some CrystalDiskMark results from 2 sucky cards and the good Sandisk.
__Test_________________Sandisk 8G Class 2___Patriot 8G Class 10____Kingston Class4 4Gig
Sequential Read :__________10.871 MB/s________20.036 MB/s___________18.700 MB/s
Sequential Write :__________6.659 MB/s________13.660 MB/s____________4.277 MB/s
Random Read 4KB (QD=32) :___3.077 MB/s_________3.444 MB/s____________2.088 MB/s
Random Write 4KB (QD=32) :__1.791 MB/s________0.038 MB/s_____________0.016 MB/s
Look at that, both the Kingston and the Patriot blow away or are close enough to the Sandisk in everything BUT....
(wait for it)....
SMALL BLOCK RANDOM WRITES
where the Sandisk is FIVE times the speed of the Patriot and TEN times the Kingston.
Now you may say, "Swizzlenuts, old pal, I KNEW that."
But for all you poor slobs who didn't, who are dragging yer sorry ass through the broken glass that is booting off of a slow SD (you know who both of you are), I hope this helps.
And now you may commence posting links to specific posts where this info was discussed in detail last December.
Click to expand...
Click to collapse
I have a Transcend 8gb class 6 and Kinkmax 8gb class 6 none work well. The Transcend is by far the better of the two. I have now ordered a 16GB Sandisk class 2 to see how that works.
Update:Transcend
Just a minor addition with a Transcend card. I'd seen many posts that swore by a Transcend Cl 6 8G card through Newegg. I ordered, received, benchmarked and loaded CM7 Nightly 37.
To cut to the chase, the Transcend sucked big hairy monkey balls. Similar small block write speeds as the other crappy cards. And the CM7 performance was predictably bad. Crappy UI response and FCs.
__Test_________Sandisk Cl2 8G___Patriot CL10 8G____Kingston Cl4 4Gig___Transcend Cl6 8G
Sequential Read___10.871 MB/s____20.036 MB/s___________18.700 MB/s___________19.930 MB/s
Sequential Write___6.659 MB/s____13.660 MB/s____________4.277 MB/s___________19.325 MB/s
Rndm Rd 4KB(QD32)__3.077 MB/s_____3.444 MB/s____________2.088 MB/s___________2.968 MB/s
Rndm Wrt 4KB(QD32)_1.791 MB/s_____0.038 MB/s____________0.016 MB/s___________0.029 MB/s
I'm sure any of these would work fine as data cards. But for running off of SD, it makes a huge difference.
Have to agree. Have 3 8gb microSD cards including a Patriot and a Kingston but the only one that reliably runs CM7 is the cheapo SanDisk
+1.
My PNY card was too slow and it took forever to download apps from market (CM7) and I replaced it with a old 8G class 2 sandisk.. Man.. no need to say it..
BTW, anyone why does sandisk makes class 6 or class 10 micro SD card? I did find the extreme III of SD card only... and not the micro card.
swoozle said:
Just a minor addition with a Transcend card. I'd seen many posts that swore by a Transcend Cl 6 8G card through Newegg. I ordered, received, benchmarked and loaded CM7 Nightly 37.
To cut to the chase, the Transcend sucked big hairy monkey balls. Similar small block write speeds as the other crappy cards. And the CM7 performance was predictably bad. Crappy UI response and FCs.
...
I'm sure any of these would work fine as data cards. But for running off of SD, it makes a huge difference.
Click to expand...
Click to collapse
I have been running off a Transcend CL6 8G card and while my install felt zippy and pretty smooth, I have been having some FC issues and random quirkiness. I believe you have smacked the nail on the head here in that what really matters is the speed of the small block random writes. Having ruled out all other possibilities, it is the only thing that may explain why I am having intermittent artifacts in my streaming video.
Thank you for posting your tests and results, gonna go grab an el cheapo Cl2 card asap.
edit: So I picked up a cheap Class 2 Sandisk 8G card and it's been rock solid on the latest nightly 41 with 4.18C test kernel.
From my experience using CM7 on different high-speed uSD cards (Kingston, Patriot and Transcend), the results between brands and within brands are inconclusive and inconsistent. I'm beginning to think it has more to do with the individual card, i.e., the luck of the draw (or lack thereof). With such hit-or-miss results, perhaps the best approach is to keep trying until you find a good one.
I'm having a similar oddity... I have CM7 installed to eMMC, and on an 8GB Class 4 SanDisk MicroSD. The microSD actually boots /faster/, and has less UI lag than the internal memory!
Wondering if I messed up the flash (redid it a few times with no real change), install process, or if the internal memory is actually slower than the microSD somehow. Kind of backward thinking to my mind, but hey...
I think SD card variability isn't sufficiently highlighted in instructions for running off the SD card. I had issues with a Transcend class 6 4 GB card but no issues with an unclassified 2 GB.
If this issue is highlighted I think it might avoid a lot of frustration.
I'm seeing similar results with my cards on Random Write 4KB(QD32):
Sandisk Class 4 4GB:_________1.175 MB/s
Random unclassified 2GB:_____0.029 MB/s
Lexar Class 4 8GB:___________0.038 MB/s
swoozle said:
__Test_________________Sandisk 8G Class 2___Patriot 8G Class 10____Kingston Class4 4Gig
Sequential Read :__________10.871 MB/s________20.036 MB/s___________18.700 MB/s
Sequential Write :__________6.659 MB/s________13.660 MB/s____________4.277 MB/s
Random Read 4KB (QD=32) :___3.077 MB/s_________3.444 MB/s____________2.088 MB/s
Random Write 4KB (QD=32) :__1.791 MB/s________0.038 MB/s_____________0.016 MB/s
Look at that, both the Kingston and the Patriot blow away or are close enough to the Sandisk in everything BUT....
(wait for it)....
SMALL BLOCK RANDOM WRITES
where the Sandisk is FIVE times the speed of the Patriot and TEN times the Kingston.
Click to expand...
Click to collapse
I have only ever seen the sequential speeds quoted in specs. In fact, if the SanDisk was only 10x faster then the Kingston would need to be .16 and not .016 right? So isn't the sandisk actually 50x and 100x faster?
How can we find card with decent random r/w performance though, does anyone spec for that?
Woops, you are correct. Missed a zero, thanks.
No, I've never seen such a spec quoted either. I imagine it's because any normal use of an SD card doesn't depend on random write speed so much.
Hm, here I had given up running anything from an SD since I failed to even boot up either Froyo or CM7 with mine. But I have a 16gb Sandisk class 2 in my other phone! Going to try that then.
Noobquestion, how do you back up an android SD-card? Can I just copy paste the entire card to my pc hard drive, and then transfer it back when I want to use it in my phone again? Or do I have to use some kind of backup program?
The results are not strange. Card class only reflects sequential speed, but random speed is more important for OS operation. For example, ReadyBoost certified Flash drives have to have certain minimum random access speed.
Similar issue was brought up when people tried to replace SD cards in WP7 phones:
the big issue is random access performance -- a figure that isn't taken into account in a card's class rating. Ironically, Microsoft discovered in its testing that cards with higher class ratings actually performed worse on Windows Phone 7 because the tweaks card manufacturers make to achieve high sequential throughput can actually hurt random access times.
http://www.engadget.com/2010/11/17/windows-phone-7s-microsd-mess-the-full-story-and-how-nokia-ca/
It's good to know that Sandisk cards generally have good random access speed. However, it's not guarantied. They may choose cheaper NAND any time in future.
Added: For guarantied result one may try to find ReadyBoost certified microSD, but I don't know if they exist, probably they certified only USB sticks.
Or, WP7-certified microSD cards just recently started to appear.
http://www.engadget.com/2011/04/15/windows-phone-7-certified-microsd-cards-emerge-at-atandt-stores/
Right now it's probably the same Sandisk card, just repackaged and priced higher. If I were to buy microSD to run OS from I would choose Sandisk and would hope that I'm lucky.
But WP7-certified cards could be a good choice if regular Sandisk cards suddenly become worse or if you just want to be sure, they should have good random access speed.
This is surprising to read. I've looked pretty much everywhere and the consensus has seemed to be that the Transcend 8GB, class 6 cards were top notch. Just ordered one off of Amazon too. Maybe I should just grab a Sandisk instead.
32gb scandisk class 10 works on thrill??
32gb works on thrill. Infact, 64GB microSDXC works on Thrill. Theoretically you can use an SD to microSD adapter and put in the Lexar 128GB SD card and the Thrill will still read the card. The question is is there a genuine class 10 32GB microSD that can write at 10+MB/S. Majority of the class 10 SD cards that I've seen can write at 15MB/S. You can silkscreen class 10 or U1 on an SD card but it doesn't mean that it will transfer at its rated speed.
I'm using a SanDisk 32GB class 2 card. It can write at 4.75MB/s.
Thanks a lot, I'm interesting at 64gb, do you know where I can find it??
i use a sandisk 32gb class 4 and i get avg 4.9 mb/s write and 22mb/s read. not bad
Sent from my LG Thrill 4G...
I have a Lexar 32Gb class 10 and get 10 Mb/s write speed on my computer and 8.8 MB/s from SD tools app on my phone (which I think can be improved).
WOOT!
I just ordered one of These!!! I'm excited to get it working now.
I am using one now. Works fine.
which one are you using? is there any finicky behavior as far as what the Thrill likes to use that anyone knows of?
I am using the sandisk 32g, class 4 or 6. Can't remember. works fine. I use Rom toolbox from the market. It has an sd speed booster. Set it to 1024 or 2048, and much faster read and write speeds. I use that app because all of the tweaks are built in to one app. Worth the few bucks.