Dell TL2000 manual Data Security on Worm Media, Worm Media Errors, Cleaning Cartridge

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.

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Figure 6-2. Ultrium WORM Tape Cartridge

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:

vThe 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.

vWhen 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:

vInformation 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.

vInserting 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.

Chapter 6. Using Ultrium Media 6-3