Dell PowerVault TL4000 Dell Model TL2000/TL4000 Tape Library- User's Guide - Page 163

Table 6-2. Ultrium data cartridge compatibility with Ultrium tape drive (continued) Tape Drive 1500 GB (Ultrium 5) LTO Ultrium Data Cartridges 800 GB 400 GB 200GB (Ultrium 4) (Ultrium 3) (Ultrium 2) 100GB (Ultrium 1) Ultrium 1 Read/Write WORM (Write Once, Read Many) Certain records retention and data security applications require a Write Once, Read Many (WORM) method for storing data on tape. The LTO Ultrium 5 drive enables WORM support when a WORM tape cartridge is loaded into the drive. 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 5 WORM cartridges are two-tone burgundy and silvery-gray. a67b0024 Figure 6-2. Ultrium Data and WORM Tape Cartridges 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. Chapter 6. Using Ultrium Media 6-3