Originally Posted by Dismal Shadow

Is there a difference between classes?

Sent from my SGSII Skyrocket running CM9 using Tapatalk 2

I've had 2 cheap sd cards die on me...
Exact same symptoms both times... First notice that some of my installed (on SD) apps are showing up with a shadow icon after a re-boot, fixable with a dismount and remount of the card, then it happens to more of the apps, then within a week or 2 the sd card reports itself as "blank or unformatted" Once it got to that point they couldn't be formatted by any device I have...

From first symptom to dead card was about 3 weeks or so total both times.

I'll cough up the extra for a decent card this time.

Originally Posted by fishlipsboy

Yes. I always go with the statement "the class is about the speed of the card". So you want the highest class possible. I suggest, in a mobile phone, so you don't really experience any lag when playing music stored on the card, you'll want to have a class 6 or higher. I always go for a class 10, if I can.

From what I understand, the phone hardware and/or rom may limit how high a class can be used. On my old HTC Aria running CM7 there was no point buying anything higher than class 6 (I used a 4 with no problems). I don't know if the skyrocket or ICS have the same issue. Still, you're not likely to notice much of a difference at class 6 or higher (depending on how you use it).

Sent from my SAMSUNG Skyrocket running SkyICS 4.2F on XDA

Originally Posted by fishlipsboy

Yes. I always go with the statement "the class is about the speed of the card". So you want the highest class possible. I suggest, in a mobile phone, so you don't really experience any lag when playing music stored on the card, you'll want to have a class 6 or higher. I always go for a class 10, if I can.

I've had a Class 2, 4, and 6 (w/UMS-1) micro SDXC cards. They were all retail packaged Sandisk. On 4 different Galaxy phones (Galaxy U, S, SII, SII Skyrocket) and one external usb reader, the transfer speed was 3.8MB-4.5MB when transferring large files. Classes didn't seem to matter on the Galaxy phones or the usb reader I had. Looking at the results of my test, I'm glad I didn't buy a 64GB micro sdxc Class 10 for double the price as it is telling me that I probably won't be seeing any speed improvements with it. I think part of the reason why it is so slow is that I'm transferring from a USB external to my USB plugged in device. But that is almost always going to be the case with me.

It would be nice to see UMS-1 compatible Galaxy phones in the future.

Tempted to get a 32gb one. I keep having to delete image backups when testing out 5 different ROMs at the same time

I had an issue with my Skyrocket and SD Cards a month or so back. The phone would take 4-5 seconds to wake up when I pressed the power key. I had a class 4 16GB Wintec MicroSD in there. When I took the MicroSD out, the phone jumped right back to normal.

Has anyone else had this problem, and more importantly, has anyone else using a Class 6+ MicroSD noticed lag time between waking the device and the display coming on? I might have to go get myself a Class 6 (if not Class 10) MicroSD if everyone's had good luck thus far.

20 Read // 11 Write via USB Adapter



23 Read // 14 Write via Samsung S3 @300mb

Format to exFAT and you get +1-2mb~ Write.

Skyrocket:

Originally Posted by UZ7

20 Read // 11 Write via USB Adapter



23 Read // 14 Write via Samsung S3 @300mb

Format to exFAT and you get +1-2mb~ Write

You need to re-run that SD card test app and change the path from sdcard to external sd card. That test ran on the internal sd card memory for the phone and not the external card. (another hint is it shows total memory size is 11GB)

Should look like this


http://www.samsung.com/us/computer/m...ge/MB-MSBGA/US
Official specs

Type
SD Card
Type
Class:10
Type
High Speed Series
Storage
32GB Capacity
Features
24MB Sequential Read Speed
Features
13MB Sequential Write Speed

Originally Posted by nest75068

You need to re-run that SD card test app and change the path from sdcard to external sd card. That test ran on the internal sd card memory for the phone and not the external card. (another hint is it shows total memory size is 11GB)

Should look like this

Ah thanks for the heads up, my bro did the benchmark on his phone so I didn't get to check it. I'll reupload it in a bit

Originally Posted by UZ7

Ah thanks for the heads up, my bro did the benchmark on his phone so I didn't get to check it.

YEah I was wondering how you got much higher spees than I did hahaha.

Max write is 13/mbs and I was hitting 10 consistantly. Max read is 24 and I couldn't get higher than 20-20.5

Originally Posted by nest75068

YEah I was wondering how you got much higher spees than I did hahaha.

Max write is 13/mbs and I was hitting 10 consistantly. Max read is 24 and I couldn't get higher than 20-20.5

Yeah the USB Adapter benchmark was giving 20/11 so I was surprised when my bro sent me his benchmarks and it was higher (I was thinking it was the benchmark itself) but I guess I overlooked the internal SD.

---------- Post added at 03:18 PM ---------- Previous post was at 02:49 PM ----------

Another 32GB Patriot Class 4:
http://www.tigerdirect.com/applicati...jNxCjCVNNC9ivo

Same price as frys.