How can a fill a hard drive with data?

[Adrian Simmons]

I've just installed a 160Gb drive in my (pre mirrored door) G4, which 
according to apple can't deal with anything over 120Gb - reports on:
http://www.xlr8yourmac.com/IDE/big_ide_drive_support.html
vary, so I'd like to test that I can read and write to the entire disk ok.
I need to fill it and then read back data from beyond the 127Gb mark.

Can anyone suggest handy command line tools for the job?

TIA

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adrinux (aka Adrian Simmons)
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