Quantum LTO-5 HH SAS C, Техническое справочное руководство

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Chapter 5: Media
WORM (Write Once, Read Many) Cartridge
Quantum LTO-5 HH SAS Model C User’s Guide 67
WORM (Write Once, Read Many) Cartridge
Certain records retention and data security applications require a Write
Once, Read Many (WORM) method for storing data on tape. The LTO
Ultrium generation 3 and 4 drives enable WORM support when a
WORM tape cartridge is loaded into the drive.
Worm Media
Because standard read/write media are incompatible with the WORM
feature, a specially formatted WORM tape cartridge (see Figure 9 on
page 67) is required. Each WORM cartridge has a unique, worldwide
cartridge identifier (WWCID), which comprises the unique CM chip serial
number and the unique tape media serial number.
Figure 9
Ultrium Data and
WORM Tape Cartridges
Data Security on WORM Media
Certain built-in security measures help ensure that the data written on a
WORM cartridge does not become compromised, for example:
• The format of a WORM Tape Cartridge is unlike that of standard
read/write media. This unique format prevents a drive that lacks
WORM-capable firmware from writing on a WORM tape cartridge.
• When the drive senses a WORM cartridge, the firmware prohibits
the changing or altering of user data already written on the tape.
The firmware keeps track of the last append-able point on the tape.