IBM F50 User Manual download pdf (Page 49)

Operating in Harsh Environments

The 8-mm tape drive is ideally suited to streaming operations, as opposed to tape

movement operations involving multiple stop/starts and random searches. When the

tape is used for frequent stop and start operations, streaming movement is beneficial

and should be used whenever possible. This can be accomplished by ensuring that

any save or restore operation is the only active operation performed by a device

connected to this SCSI I/O controller.

Any tape that has been used outside the ranges specified in the table on 2-22 for an

extended period of time (50 passes in 40 hours of nonstop operation) should not be

used as an archival tape. Exposure to the environment will deteriorate the magnetic

and physical strength of the tape. Do not store important data on a tape that has

been used outside the specified ranges; transfer the data to a new tape for reliable

archiving.

8-mm Data Cartridge Erasure

Most bulk eraser devices do not have the capability to erase 8-mm data cartridges.

To properly erase an 8-mm data cartridge with a bulk eraser device, the erasure

rating must be at least 1500 oersted.

The 2.3GB and the 5.0GB 8-mm tape drives erase residual data before writing new

data on the data tape.

Tape Cartridge Data Efficiency

The 8-mm tape cartridge efficiency is defined as the amount of data that can be

stored on the cartridge. The following variables affect the amount of data that can be

stored on a tape cartridge:

 Size of the data file

 Number of file marks per file

 File mark size used

 Compatibility mode (2.3GB or 5.0GB)

 Media rewrites.

Chapter 2. Using the System Unit 2-23

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IBM F50 User Manual Page 49