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buffers and close volume) and reports a physical end-of-tape check condition at
the end of the scaled region, just as it would if unscaled tape reached the real
physical end of the tape.
Capacity scaling is not offered on any of the short length (economy) cartridge
types (JJ, JK, or JL), or on the WORM cartridges (JW, JX, JY, JR, JY, and JZ).
Capacity scaling is only offered on the JA, JB, JC, and JD cartridge types.
Three important attributes are controlled by the setting of the Capacity Scaling
byte value:
v The total Medium Capacity
v The ability to perform the RABF function on an entire cartridge, including last
wraps
v Information about whether the format is segmented. If the format is segmented,
a fast-access segment is created on the front part of the tape followed by a larger
remainder segment that occupies the remainder of the tape. The fast access
segment is always filled (written) first, followed by the filling of the remainder
segment. For some applications that want improved access attributes for
partially filled cartridges but still want to use full capacity (if required) without
rescaling, this option is available.
It is important to note that the scaled state and attributes (segmentation, RABF) of
the cartridge format is retained when a cartridge is reformatted between the J1A
and E05 logical formats, although the exact resulting used capacity as a percentage
of full capacity is not identical for all mapped settings.
3592 data cartridge
This section describes the capacity, construction, operation, and components of the
IBM 3592 Enterprise Tape Cartridge.
The 3592 tape drive has a bidirectional read/write head with an Enterprise Tape
3592 format. The TS1140, TS1150, and TS1155 tape drives write or read 32 tracks at
a time. The capacity of 3592 data cartridges varies by drive model and recording
format. See the 3592 tape cartridges in "Supported tape cartridges" on page 26 for
these details.
Encryption-enabled TS1140, TS1150, and TS1155 tape drives encrypt the data after
compression.
Figure 44 on page 142 shows an IBM 3592 tape cartridge and its components.
#
Component
Cartridge case
1
Cartridge bar code label
2
Volume serial (VOLSER)
3
number
Label area
4
#
Component
IBM product label
5
Cartridge door
6
Write-protect switch
7
Stacking indent
8
Chapter 2. Planning
141
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