Write once, read many (WORM) cartridges
Certain Records retention and data security applications require a WORM (write once, read many)
method for storing data on tape. The LTO Ultrium 8, Ultrium 7, Ultrium 6, Ultrium 5, and Ultrium 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 108) is required. Each WORM cartridge has a unique, worldwide
cartridge identifier (WWCID), which consists of the unique CM chip serial number and the unique tape
media serial number. .
Data security on WORM media
Certain built-in security measures help ensure that the data that is written on a WORM cartridge does
not become compromised, for example:
v
The format of an Ultrium 8, Ultrium 7, Ultrium 6, Ultrium 5, or Ultrium 4 WORM tape cartridge is
unlike standard read/write media. This unique format prevents a drive that lacks WORM-capable
firmware from writing on a WORM tape cartridge. For LTO 8, native data capacity is 12000 GB and
compressed data capacity is 30000 GB.
v
When the drive senses a WORM cartridge, the firmware prohibits the changing or altering of user data
that is already written on the tape. The firmware tracks the last point on the tape that can be
appended.
WORM media errors
The following conditions cause WORM media errors to occur:
v
Information in the servo manufacturer's word (SMW) on the tape must match information from the
cartridge memory (CM) module in the cartridge. If it does not match, a media error code
7
posts on
the drive's single-character display (SCD).
v
Inserting a WORM tape cartridge into a drive that is not compatible with WORM causes the cartridge
to be treated as an unsupported medium. The drive reports a media error code
7
. Upgrading the drive
firmware to the correct code level resolves the problem.
Requirements for WORM capability
To use the WORM capability of your LTO Ultrium generation 7, 6, 5, or 4 drive, you must use a
compatible WORM tape cartridge. See “Cartridge compatibility” on page 93 for cartridge and VOLSER
compatibility.
Figure 108. Ultrium data and WORM tape cartridges
94
Dell PowerVault TL1000 Tape Autoloader: User's Guide
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