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Chapter 5: Media
Types of Cartridge
Write-Protect Switch
Capacity Scaling
66
statistical information about the cartridge's use. The LTO-CM enhances
the efficiency of the cartridge. For example, the LTO-CM stores the end-
of-data location which, when the next time this cartridge is inserted and
the Write command is issued, enables the drive to quickly locate the
recording area and begin recording. The LTO-CM also aids in
determining the reliability of the cartridge by storing data about its age,
how many times it has been loaded, and how many errors it has
accumulated. Whenever a tape cartridge is unloaded, the tape drive
writes any pertinent information to the cartridge memory.
The LTO-CM storage capacity of the LTO Ultrium 6 is 16320 bytes, LTO
Ultrium 4 and 5 is 8160 bytes, and Ultrium 1, 2, and 3 is 4096 bytes.
The position of the write-protect switch on the tape cartridge (see 4 in
Figure 8
on page 64) determines whether you can write to the tape. If
the switch is set to:
• The locked position (solid red), data cannot be written to the tape.
• The unlocked position (black void), data can be written to the tape.
If possible, use your server's application software to write-protect your
cartridges (rather than manually setting the write-protect switch). This
allows the server's software to identify a cartridge that no longer
contains current data and is eligible to become a scratch (blank) data
cartridge. Do not write-protect scratch (blank) cartridges; the tape drive
will not be able to write new data to them.
If you must manually set the write-protect switch, slide it left or right to
the desired position.
To control the capacity of the cartridge (for example, to obtain a faster
seek time) issue the SCSI command SET CAPACITY. For information
about this command, refer to the Quantum System Storage Ultrium
Tape Drive SCSI Reference.
Quantum LTO-5 HH SAS Model C User's Guide
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