IBM System Storage TS2230, Руководство по установке, эксплуатации и обслуживанию

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Types of Cartridges
IBM Ultrium media is available in the following types:
v
“Data Cartridge”
v “WORM (Write Once, Read Many) Cartridge” on page 4-3
v
“Cleaning Cartridge” on page 4-4
Data Cartridge
All generations of IBM Ultrium data cartridges contain 1/2-inch, dual-coat,
metal-particle tape. When processing tape in the cartridges, Ultrium Tape Drives
use a linear, serpentine recording format.
Each generation of data cartridge is identified by case color, native data capacity,
recording format and nominal cartridge life.
Data Cartridge Case Color
Native Data
Capacity
Recording Format*
Nominal Cartridge Life
(load/unload cycles)
Ultrium 3 Slate Blue 400 GB (800 GB at
2:1 compression) Reads and writes data on 704
tracks, sixteen tracks at a time 20,000
Ultrium 2 Purple 200 GB (400 GB at
2:1 compression) Reads and writes data on 512
tracks, eight tracks at a time 10,000
Ultrium 1 Black 100 GB (200 GB at
2:1 compression) Reads and writes data on 384
tracks, eight tracks at a time 5,000
* The first set of tracks (sixteen for Ultrium 3; eight for Ultrium 2 and 1) is written from near the beginning of the
tape to near the end of the tape. The head then repositions to the next set of tracks for the return pass. This process
continues until all tracks are written and the cartridge is full, or until all data is written.
Cartridge Memory Chip (LTO-CM)
All generations of the IBM LTO Ultrium Data Cartridges include a Linear
Tape-Open Cartridge Memory (LTO-CM) chip (
1
in Figure 4-1 on page 4-1), that
contains information about the cartridge and the tape (such as the name of the
manufacturer that created the tape), as well as 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.
LTO Generations 1, 2, and 3 have an LTO-CM capacity of 4096 bytes.
Write-Protect Switch
The position of the write-protect switch on the tape cartridge (see
4
in Figure 4-1
on page 4-1) determines whether you can write to the tape. If the switch is set to:
v The locked position (solid red), data cannot be written to the tape.
v
The unlocked position (black void), data can be written to the tape.
4-2
TS2230 Tape Drive Setup, Operator and Service manual