
Bytes 01 through 03 - Number of Blocks
In the MODE SENSE data, this field indicates the total capacity of the
tape in 1-KByte physical blocks (LBOT to LEOT). The CTS
determines this value when it loads a tape. This field is ignored by
theCTSintheMODESELECTcommand.
Bytes 05 through 07 - Block Length
The Block Length field defines the length in bytes of each logical
block, in uncompressed format, described by the Block Descriptor. A
value of 0 for the Block Length field indicates variable-length logical
blocks. A value greater than 0 indicates fixed-length logical blocks.
The power-on default value for the block length is 400h (1,024) bytes.
The limit on the block length is 03C000h or 240 KBytes, which is the
maximum block length specified by the Read Block Limits data (see
Chapter 13).
Notes:
If you specify a number greater than 03C000h (240 KBytes) for the
Block Length, the CTS returns Check Condition status with the
sense key set to Illegal Request (5h).
If the value specified for the Block Length field is not divisible by
4 (or 2 if the EEPROM image is set for two-byte boundary
disconnect), even-byte disconnect is disabled when the CTS
updates the logical block length.
10-20
EXB-8205 and EXB-8505
(Standard and XL)
510503
10 MODE SELECT (15h) and MODE SENSE (1Ah)
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