SD Card write speeds?

estra

Member
Aug 9, 2012
1
0
Hello,

My tablet has the standard SD card slot and I'm just wondering if write speeds are important when using SD cards on tablets. For example:

Amazon.com: SanDisk 32GB SDHC Flash Memory Card (SDSDB-032G-B35): Electronics
or
Amazon.com: SanDisk Extreme 32GB 30MB/s SDHC Flash Memory Card (SDSDX-032G-X46): Electronics

What's the better buy between the two? Am I going to be okay with the normal blue Sandisk SD card or does the 45 mb/s from the Sandisk Extreme actually does something for tablets?
 

Spider

Administrator
Staff member
Mar 24, 2011
15,785
1,813
As long as you get a class 4 or higher SD card, you should not have a problem.
 

vampirefo.

Senior Member
Developer
Nov 8, 2011
3,836
1,394
The higher the class the faster the transfer of data. I buy class 10 myself.
 

mugglesquop

Member
Jul 30, 2012
57
2
as Spider said, Class 4 is reasonable, any lower than that and programs (if running off SD) can hang and you will just get annoyed with the time it takes to do things.
 
Aug 8, 2012
43
11
I picked up a Pny class 10 16GB card at Staples for $20 last night. It isn't the best, but a pretty good deal for the price.
 

vampirefo.

Senior Member
Developer
Nov 8, 2011
3,836
1,394
I picked up a Pny class 10 16GB card at Staples for $20 last night. It isn't the best, but a pretty good deal for the price.

I use these Newegg.com - ADATA 16GB Class 10 Micro SDHC Flash Card with SD adaptor Model AUSDH16GCL10-RA1

They are cheap and do what I want with them, I mainly run my tablets from them, make three partitions on them 1GB for system, 4GB for data the rest for sdcard.

busybox df -h
Filesystem Size Used Available Use% Mounted on
tmpfs 407.1M 44.0K 407.1M 0% /dev
tmpfs 407.1M 0 407.1M 0% /mnt/asec
tmpfs 407.1M 0 407.1M 0% /mnt/obb
/dev/block/mmcblk0p3 1.4G 253.7M 1.2G 18% /system
/dev/block/mmcblk0p2 3.9G 512.7M 3.2G 13% /data
/dev/block/nandh 252.0M 4.1M 247.8M 2% /cache
/dev/block/vold/179:1 10.0G 2.1G 7.9G 21% /mnt/extsd/179_1
/dev/block/vold/93:64 2.1G 1.1G 1.1G 50% /mnt/sdcard
/dev/block/vold/93:64 2.1G 1.1G 1.1G 50% /mnt/secure/asec
 
Aug 8, 2012
43
11
I use these Newegg.com - ADATA 16GB Class 10 Micro SDHC Flash Card with SD adaptor Model AUSDH16GCL10-RA1

They are cheap and do what I want with them, I mainly run my tablets from them, make three partitions on them 1GB for system, 4GB for data the rest for sdcard.

busybox df -h
Filesystem Size Used Available Use% Mounted on
tmpfs 407.1M 44.0K 407.1M 0% /dev
tmpfs 407.1M 0 407.1M 0% /mnt/asec
tmpfs 407.1M 0 407.1M 0% /mnt/obb
/dev/block/mmcblk0p3 1.4G 253.7M 1.2G 18% /system
/dev/block/mmcblk0p2 3.9G 512.7M 3.2G 13% /data
/dev/block/nandh 252.0M 4.1M 247.8M 2% /cache
/dev/block/vold/179:1 10.0G 2.1G 7.9G 21% /mnt/extsd/179_1
/dev/block/vold/93:64 2.1G 1.1G 1.1G 50% /mnt/sdcard
/dev/block/vold/93:64 2.1G 1.1G 1.1G 50% /mnt/secure/asec

Those cards are a nice deal. The reviews say that they die after about 6 months of regular use. The Pny has similar problems reported. I am running a Samsung class 10 atm with 24MB/s read & 21MB/s write. (after reading the reviews on the Pny, I decided not to use it for now.)
Thanks to your directions and boot image (and rom) , I am running my tablet from a partitioned card as well.
 
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