WORM Media
Because standard read/write media are incompatible with the WORM feature, a
specially formatted WORM tape cartridge (see Figure 6-2) 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.
Ultrium 4 WORM cartridges are two-tone green 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 4 800 GB or Ultrium 3 400 GB 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.

v 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 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 will post on the drive’s single-character display
(SCD). An error will also be displayed on the Operator Control Panel.

v Inserting a WORM tape cartridge into a drive that is not WORM capable causes

the cartridge to be treated as an unsupported medium. The drive will report a
media Error Code 7. Upgrading the drive firmware to the correct code level will

resolve the problem.

Cleaning Cartridge
With each library, a specially labeled LTO Ultrium Cleaning Cartridge is supplied
to clean the drive head. The drive itself determines when a head needs to be
cleaned. It alerts you by lighting the ″Clean Drive″ (amber LED) above the library
Operator Control Panel. To clean the head manually, insert a cleaning cartridge
into the tape load compartment (see “Inserting the Cleaning Cartridge” on page
4-34). The drive performs the cleaning automatically. When the cleaning is finished,
the drive ejects the cartridge, and the library turns the ″Clean Drive″ LED off.
Some libraries have an Auto Clean function which, when enabled, will prompt the
library to retrieve the cleaning cartridge that resides in the library, insert it in the
drive that needs cleaning, clean the drive, then return the cleaning cartridge to its

home slot.

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Figure 6-2. Ultrium WORM Tape Cartridge
Chapter 6. Using Ultrium Media 6-3