Fake USB stick testing tool?

suse_nerd · 02-02-2010, 07:05 AM

I am looking for a tool or command to test a USB pen drive.

This would typically involve outputting 8GB or 4GB of data from /dev/random (for example) to the pen drive, then reading it back and checking that 4GB/8GB is read back correctly or if in fact there is any errors when writing.

Does such a command exist or can it be made?

Perhaps using dd or something similar.

I know Windows utilities exist, so it must be possible on linux!

thanks

jschiwal · 02-02-2010, 08:06 AM

Why not create such a file, and using md5sum on it before and after copying it to the pendrive.

tredegar · 02-02-2010, 08:11 AM

Make a big file with dd

Code:

dd if=/dev/random of=abigfile bs=1024 count=4096K

(this may take sme time)
copy the file to the stick
rename your original file:

Code:

mv abigfile original

copy the file back from the stick
and compare it to the original

Code:

diff original abigfile

That do it for you?

suse_nerd · 02-02-2010, 08:25 AM

Yeah I think something like this would work

Code:

#Pass arguments
# $1=path to flash drive
# $2=size of file
MINPARAMS=2

if [ $# -lt "$MINPARAMS" ]
then
  echo
  echo "This script needs at least $MINPARAMS command-line arguments!"
  echo "Usage: checkflash.sh /location/to/mounted_drive size_of_file_in_GB"
  echo "Example checkflash.sh /mnt/disk 2"


  exit 0
fi

echo "Flash drive is at " $1
echo "Testing " $2 " file"

#Calculate block count
VAR=$(( $2 * 1000 ))

#Calculate checksum for desired file size from /dev/zero (no data is put on HD)
echo "Checksum should be: "
dd if=/dev/zero bs=1MB count=`echo $VAR` | md5sum

#Really copy the file to the flash drive and calculate a checkum on the flash drive file
echo "Checksum on copying to flash drive is..."
dd if=/dev/zero of=`echo $1`/testfile bs=1MB count=`echo $VAR` 
md5sum `echo $1`/testfile

#Calculate checksum of file after copying it from flash to hard drive (no data is put on HD)
echo "Checksum on copying back is..."
dd if=`echo $1`/testfile  bs=1MB count=`echo $VAR` | md5sum

Edit: The above seems to work.