DAT Tape Compression

Microsoft Windows 2003 server - 5 users
May 15, 2010 at 08:03:14
Specs: Windows 2003 Server

I've recently been given a Compaq 20/40GB
DDS4 Dat Drive for my server. I have two
20GB(native) tapes that will hold 40GB
compressed data.

The problem is, that after going through the
backup wizard, i check the box that says
"Enable hardware compression" (which is
supported with this drive) But it will only fill
20GB. It always fails and spits out the tape at
about 18-19GB, complaining that it's full.

Am i missing something?


See More: DAT Tape Compression

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May 15, 2010 at 08:13:46
If the hard drive is already compressed then further compression is unlikely. The only way the dat tape software can double (typical, not set in stone) the storage capacity is to compress files. This is done by two methods. compressing the files themselves and eliminating slack space on the drive.

If files are already compressed either because of the nature of the file, or because software has already compressed the file then no appreciable further gains can be had.

Examples of naturally compressed files are mp3 & jpg files, which both have already been shrunk by removal of some of the data.

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May 15, 2010 at 08:29:44
Ah ok thankyou very much :)

As it turns out the main files im trying to back up are jpgs


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May 15, 2010 at 13:11:55
No problem

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