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I have an extenal HP DAT 160 USB. The system i use is a Windows Server 2003, i launch a backup over the device with NTBackup.
I cannot store in the dat more than 80 GB, that is the hardware compression seems not to work.

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Perhaps your data isn't compressible. – Tom O'Connor Jul 24 '12 at 13:32
Was about to say just the same thing Tom - @AgostinoX, have you tried zipping this data you're backing up? this'll tell you how compressible it is. Oh and have you considered just using a portable hard disk for this, it won't last as long but it'll be much quicker and have more capacity. – Chopper3 Jul 24 '12 at 13:35
i thought that hc had not to do with software compression, does it? – AgostinoX Jul 24 '12 at 13:55

You need to make sure your system is using hardware compression.

NTBackup had a bug in the early W2003 editions that disabled hardware compression by default. Microsoft has a support note and hotfix for this behavior.

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