User's Guide

Page 130 DDS-4 SCSI Interface Manual, Rev. B
Field Name Bytes Bits Description
Bits per MM 5-7 Bits per millimeter per track. Value depends on density code
DDS3-DDS4 – 12C0h
DAT 72 – 1838h
Media width 8-9 Media width in tenths of millimeters. Specification width is 3.8 mm, this
value is 26h
Tracks 10-11 Tracks on a helical scan drive are defined as 1.
Capacity 12-15 The capacity is in megabytes and the value correlates with the primary
density code as follows:
25h – 2EE0h
26h – 4E20h
47h – 8CA0h
Assigning
organization
16-23 This field contains the ASCII text “Seagate” padded with blanks
Density
name
24-31 Density name is ASCII data which correlates to the primary density
code as follows:
25h - DDS3
26h - DDS4
47h - DAT 72
Description 32-51 This field contains descriptive ASCII data.
Completion Status
The Completion Status for the REPORT DENSITY SUPPORT command is shown in
the following table.
Code Message Description
00h Good
Status
• The drive is ready to perform any appropriate command.
• The drive remains in any previously set mode.
• The tape position is unchanged
Extended Sense Byte 02h
Code Message Description
02h Not ready Media bit = 1 and drive not in ready state
04h Hardware
Error
Drive hardware error detected during
command execution
05h Illegal
request
The CDB contains an invalid bit
02h Check
Condition
06h Unit
Attention
• Cartridge change prior to accepting the
command.
• Drive reset prior to accepting the command