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HP DDS-4 Tape

petes · 2005-07-14 10:39:51

Quick question. I have 40Gb hp tape cartridges assuming 2:1 data compression. Does that mean 40Gb is the max it can hold. I presume it is. Cheers. /edit or is it 80Gb.

14-07-2005 10:39am

#1

petes

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Quick question. I have 40Gb hp tape cartridges assuming 2:1 data compression. Does that mean 40Gb is the max it can hold. I presume it is. Cheers.

/edit or is it 80Gb.

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Comments

#2 08-08-2005 10:52am

Capt'n Midnight

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A DDS 4 tape should be labelled as 20/40 ie:
20GB native and 40 GB if and only if you can get 2:1 compression

They usually quote the 2:1 figure and in practice it's usually 1.6-1.7:1 depending on the type of data.

DLT IV tapes can be confusing about how much data you can store on them.
A HP DLT 4000 Drive will store about 36GB on a 20GB native DLT IV tape (quoted at 40GB 2:1)
A DLT 7000 will store 35GB native on the same tape (sales call it 70GB of compressed data)
A Vs80 will store 40GB native and probably about 70GB of real live compressed data but won't be able to overwrite the tape if used in either of the other two drives.

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