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Use the correct media
In order to maximize drive and media reliability, normally use the autoloader to provide one
week's backup per magazine. Ideally, use five cartridges and one cleaning cartridge in each
magazine. This allows you to perform a full backup, up to 40 (DDS-4) GB or 72 (DAT 72) GB
each working day, and ensures that the tape heads are cleaned once a week.
Data cartridges
For optimum performance and storage capacity, use tape cartridges that match your drive's
format, and use only one brand and type (tape length) of data cartridge in a magazine. For
example, do not use DDS-4 (150m) cartridges with DAT 72 (170m) cartridges. Ideally, use
HP’s DDS-4 cartridges with DAT 40x6 autoloaders and HP’s DAT 72 cartridges with DAT 72x6
autoloaders.
Although HP StorageWorks DAT autoloaders are fully backward compatible, old tape formats
are more abrasive than later generations and using older tape formats can reduce the life
expectancy of the autoloader. The compatibility between drive models and cartridges is
summarized in the following table. Shaded boxes show the recommended media for each
autoloader.
table 2: data cartridge compatibility
Write-protecting cartridges
If you want to protect the data on a cartridge from being altered or overwritten, you can write-
protect the cartridge. (See figure 13.)
Always remove the cartridge from the autoloader before you change the write protection.
• To write-protect a cartridge, slide the tab on the rear of the cartridge so that the recognition
hole is open.
• To write-enable a cartridge, slide the tab back so that the hole is closed.
Write-protection will not protect your cartridges against magnets (or bulk erasers).
For best performance we recommend HP branded media. Order online at:
www.hp.com/go/storagemedia
. If you do not have internet access, refer to the User’s
Guide on the HP StorageWorks Tape
CD-ROM for ordering information for tape cartridges
and cleaning cartridges.
DDS-1
90 meter
DDS-2
120 meter
DDS-3
125 meter
DDS-4
150 meter
DAT 72
170 meter
HP StorageWorks DAT 40x6 read only read/write read/write
40 GB*
(C5718A)
not supported
HP StorageWorks DAT 72x6 not supported not supported read/write read/write
72 GB*
(C8010A)
* Capacity assumes 2:1 compression.
autoload_master-frame6.fm Page 29 Monday, December 29, 2003 9:39 AM