Write a disk full with files with random or zero data

I wanted to test a hard-drive that halted when its internal temperature raised above its safety level. hdparm is one option but the script below creates different files with a certain given size.

while [ true ]; do
dd if=/dev/zero of=file$COUNTER bs=$1 count=1024

You can replace /dev/zero with /dev/random if you want random data. Call the script with one argument, the file size.

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