Dell PowerVault TL1000 - Manual (Page 112)

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. Ultrium 6 WORM cartridges are two-tone black and silvery-gray.
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:
v The format of an Ultrium 6, Ultrium 5, or Ultrium 4 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.
For LTO 6, native data capacity is 2500 GB and compressed data capacity is 6250
GB.
v When the drive senses a WORM cartridge, the firmware prohibits the changing
or altering of user data that are already written on the tape. The firmware tracks
the last appendable point on the tape.
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 6, 5, or 4 drive, you
must use a compatible WORM tape cartridge. See “Cartridge compatibility” on
page 5-3 for cartridge and VOLSER compatibility.
Cleaning cartridge
An Ultrium Universal Cleaning Cartridge is required to clean the tape drive. The
drive itself determines when it must be cleaned and notifies the library. When
notified, the library indicates that the drive needs cleaning by turning ON the
"Clean Drive" LED on the front panel of the library and posting a message on the
library display.
Figure 5-2. Ultrium data and WORM tape cartridges
5-4 Dell PowerVault TL1000 Tape Autoloader User's Guide
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