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6.14
MODE SELECT
(ISH)
BIT
BYTE
07
06
05
04
03
02
01
00
00
---0--I---0--I---0--I---i--I---0--I---i--I---0--I---i--
01
Logical Unit Number
I
Reserved
02
Reserved (0)
03
Reserved
(0)
04
Number of Bytes
05
Reserved (0)
I
Flag
I
Link
Figure 6-23.
MODE SELECT Command
This command is used by the ACB-5500 to specify formatting param-
eters and should always preceed the FORMAT UNIT command. When a
Blown Format error (lC H ) is detected due to the controller being
unable to read the drive parameter information from a drive
already formatted, the user may use this command to inform the
controller about the drive information.
Once initialized, most
data on the drive may be recoverable.
The information can then
be recovered and the drive reformatted.
Writes to the drive will
not be permitted.
Byte 04 of the command specifies the number of information bytes
to be passed with the command. The ACB-5500 will post an Invalid
Argument error unless this equals 22 (l6 H ) or 24 (18 H ) bytes.
The Mode Select parameters are architecturally divided by the
SCSI document into a header (bytes 00-03), a block descriptor
(bytes 04-0B),
and vendor unique parameters.
The following
parameters are required by the ACB-5500.
Note:
After issuing a Mode Select Command, only the Read Command
is executable before a new Format Command is executed.
500504-00
6-31
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