HP 2600fx - Optical Disk Drive Command Reference Manual page 142

Optical drive and library for fx, ex and mx models
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Transfer
Length
PBA
SC
Rel Adr
NOTE
When this command is executed with 14X 512 or 1024 byte/sector media,
the drive will return a CHECK CONDITION status. The sense key/
additional sense code will be set to ILLEGAL REQUEST/INVALID
COMMAND.
Chapter 2
The Transfer Length field specifies the number of bytes
of data and ECC information to be read:
• 4096 media = 4760 bytes (4096 data + 664 pointer,
CRC, pad, & ECC) For 9.1 Gbyte Capacity drives
only.
• 2048 media = 2380 bytes (2048 data + 332 pointer,
CRC, pad, & ECC) For 5.2 Gbyte Capacity drives
only.
• 1K media = 1200 bytes (1024 data + 176 pointer, CRC,
pad, &ECC)
• 512 media = 610 bytes (512 data + 98 pointer, CRC,
pad, &ECC)
• All other numbers are rejected unless SC = 1
A Physical Block Address bit of 1 indicates that physical
block addressing is used.
A PBA bit of 0 indicates that logical block addressing is
used.
A Sector Count bit of 1 indicates the transfer length is
represented in sectors rather than bytes. A "sector"
consists of 2380 bytes for 2K media, 1200 bytes for 1K
media, or 610 bytes for 512 media.
A Sector Count bit of 0 indicates the transfer length is
represented in bytes.
A relative address bit of one indicates that logical block
address specified is a two's complement offset from the
last logical block address accessed.
A value of 0 indicates that the logical block address is an
absolute address.
SCSI-2 Drive Command Set
Read Long Command (3EH)
2-105

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