Figure 16. Cartridge System Tape

Cartridge File Protection

Each tape cartridge includes a ®le-protect selector„3… (see Figure 16) that, when set to the ®le-protect position, prevents writing on or erasing data from the tape.

Normally, cartridges used in the 3494 should not be manually ®le-protected. If required, software can be used to ®le-protect the cartridges. This allows the host, when appropriate, to identify a cartridge that no longer contains current data and can be a scratch cartridge. Do not ®le-protect scratch cartridges because new data cannot be written to ®le-protected cartridges. For additional information, refer to Care and Handling of the IBM Magnetic Tape Cartridge

Cartridge System Tape Labels

Each tape cartridge in the 3494 must have external labels that are operator- and machine-readable. The labels identify the volume serial number (volser) and type of cartridge. Currently supported labels are Tri-Code, available from Wright Line Corporation, Tri-Optic, available from Engineered Data Products, and labels from Information Data Storage.

Note: The only exception for the label requirement is when using the Unlabeled Tape Operations function. See ªUnlabeled Tape Facilityº on page 22 for more information.

The volser label contains up to six characters, and the separate media-type label provides a seventh character for media-type identi®cation. A volser can contain one to six characters, with blanks padded on the right for a volser with fewer than six characters. Characters can be uppercase A±Z and numerics 0±9. Each tape cartridge typically has a separate single-character media-type label that identi®es the cartridge type. The media-type label character for a Cartridge System Tape is 1, for an Enhanced Capacity Cartridge System Tape is E, and for High Performance Cartridge Tape is J.

Note: See ªCartridge Tapeº on page 18 for the process used to determine the cartridge media type.

20Magstar 3494 Tape Library Operator Guide

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IBM Magstar 3494 manual Cartridge File Protection, Cartridge System Tape Labels