WORM MediaBecause standard read/write media are incompatible with the WORM feature, aspecially formatted WORM tape cartridge (see Figure 6-2) is required. Each WORMcartridge has a unique, worldwide cartridge identifier (WWCID), which comprisesthe 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 MediaCertain built-in security measures help ensure that the data written on a WORMcartridge does not become compromised, for example:v The format of an Ultrium 4 800 GB or Ultrium 3 400 GB WORM Tape Cartridgeis unlike that of standard read/write media. This unique format prevents a drivethat lacks WORM-capable firmware from writing on a WORM tape cartridge.v When the drive senses a WORM cartridge, the firmware prohibits the changingor altering of user data already written on the tape. The firmware keeps track ofthe last appendable point on the tape.WORM Media ErrorsThe following conditions cause WORM media errors to occur:v Information in the servo manufacturer’s word (SMW) on the tape must matchinformation from the cartridge memory (CM) module in the cartridge. If it doesnot 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 causesthe cartridge to be treated as an unsupported medium. The drive will report amedia Error Code 7. Upgrading the drive firmware to the correct code level willresolve the problem.Cleaning CartridgeWith each library, a specially labeled LTO Ultrium Cleaning Cartridge is suppliedto clean the drive head. The drive itself determines when a head needs to becleaned. It alerts you by lighting the ″Clean Drive″ (amber LED) above the libraryOperator Control Panel. To clean the head manually, insert a cleaning cartridgeinto the tape load compartment (see “Inserting the Cleaning Cartridge” on page4-34). 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 thelibrary to retrieve the cleaning cartridge that resides in the library, insert it in thedrive that needs cleaning, clean the drive, then return the cleaning cartridge to itshome slot.a67b0024Figure 6-2. Ultrium WORM Tape CartridgeChapter 6. Using Ultrium Media 6-3
