how to test SD read/write speed

[fuskeren]

Hey guys
I tried this test, and now my ext. HD is... disfunctional. any hints on my f*** up?
please note.. I am a newbie at ubuntu

You can use DD to test disk speed, but it can easily lead to damaged data (partitions) if used incorrectly but is probably the most direct way of testing.

So for example my second internal disk is mount /media/HD2 so running this gives me the write speed:

dd count=1k bs=1M if=/dev/zero of=/media/HD2/test.img
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB) copied, 7.69365 s, 140 MB/s

that command writes 1GB to the disk, this large number is because the filesystem on the device will speed up the transfer by caching the data if a small transfer is carried out.

--edit--
This is a VERY dangerous command if you miss-type the output file so obviously take care using it and be sure to type correctly!

[danwood76]

You probably didn't read my instructions correctly and wrote zeros to the partition table of your disk. Probably over the first 1GB of data as well.

Depending on the original filesystem the data on the drive may be toast. A program like testdisk might be able to recover the data that was on there.

If there was no data on there just repartition using the Ubuntu disk utility.

[tux-gamer]

Hi, i find this thread from Google and i want to share something here.

You can test SD Card / MicroSD Card with H2testtw 1.4
I Use it with wine 1.3.34 to test my MicroSD , i have Visipro 16GB Class 10

Info from dmesg

device eth1 entered promiscuous mode
usb 1-3: USB disconnect, address 21
usb 1-3: new high speed USB device using ehci_hcd and address 22
usb 1-3: New USB device found, idVendor=048d, idProduct=1336
usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
usb 1-3: Product: Mass Storage Device
usb 1-3: Manufacturer: Generic
usb 1-3: SerialNumber: 00000000000006
scsi29 : usb-storage 1-3:1.0
scsi 29:0:0:0: Direct-Access     Generic  Storage Device   0.00 PQ: 0 ANSI: 2
sd 29:0:0:0: Attached scsi generic sg4 type 0
sd 29:0:0:0: [sde] 31291392 512-byte logical blocks: (16.0 GB/14.9 GiB)
sd 29:0:0:0: [sde] Write Protect is off
sd 29:0:0:0: [sde] Mode Sense: 03 00 00 00
sd 29:0:0:0: [sde] Assuming drive cache: write through
sd 29:0:0:0: [sde] Assuming drive cache: write through

and here the h2testw result:


I Hope it could help you guys.

[sp88]

Hi,

The read write performance test can be done with the help of couple of tools available out there..Taking an average out of all of them will be a better way to determine the actual speed.
Some tools are as below:
fio
iozone
bonnie
dd
seeker
hdparm
etc...Some of the tools are explained here.
read write performance test