IBM TS4300 3555, User Manual

Page: 189 / 262

WORM media
Because standard read/write media are incompatible with the WORM feature, a specially formatted
WORM tape cartridge (see Figure 87 on page 159) 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 8 WORM media are two-tone burgundy and silvery gray. See
“Ordering media supplies” on page 172 for information about how to choose and purchase the
appropriate WORM tape cartridges for your tape drive.
Note: All IBM drive firmware allows the use of WORM media.
Figure 87. LTO Data and WORM tape cartridges
Data security on WORM media
Certain built-in security measures help ensure that the data that is written on a WORM cartridge do 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. For LTO 8,
native data capacity is 12000 GB and compressed data capacity is 30000 GB.
• 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 appendable point on the tape.
WORM media errors
The following conditions cause WORM media errors to occur.
• 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).
• 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 .
WORM requirements
To add WORM capability to your IBM LTO drives, you must use either IBM LTO 8 12000 GB WORM tape
cartridges, IBM LTO 7 6000 GB WORM tape cartridges, or IBM LTO 6 2500 GB WORM tape cartridges. See
“Ordering media supplies” on page 172.
Cleaning cartridge
With each library, a specially labeled IBM Cleaning Cartridge is required to clean the drive head. The drive
itself determines when a head must be cleaned. It alerts you by lighting the Clean Drive (amber LED) on
the Operator Panel. IBM recommends the use of the Auto Clean function on this library. When enabled,
the library retrieves the cleaning cartridge, inserts it in the drive that needs cleaning, cleans the drive,
then returns the cleaning cartridge to its home slot. To clean the head manually, insert a cleaning
cartridge into the tape load compartment. The drive completes the cleaning automatically. When the
Appendix B. LTO media 159