User's Guide

Commands: Mode Select (15h) Page 83
Field
Name Bytes Bits Description
REW bit 8 0 The default value for the REW bit is 0.
The Report Early Warning (REW) bit determines whether or not the
drive reports an early-warning condition on a read operation. The
effect of this bit is different for read and write operations.
For read-type operations, if this bit is 0, the drive does not report the
early-warning condition. This setting is recommended for applications
where the intent is to read data from tape until the end-of-recorded-
data (EOD) or end-of-partition (EOP) is reached.
If this bit is 1, the drive returns a Check Condition status with an End-
of-Medium (EOM) bit of 1 when the logical early-warning position is
encountered during read-type operations.
For write-type operations, the drive always reports the Check
Condition status when the logical early-warning position is
encountered during a WRITE command. The intent of this action is to
warn the host that the EOP is approaching and that any additional
data will be written at the risk of an unexpected EOP.
If REW = 1 and SEW = 0, the drive returns a Check Condition status
with the sense key set to Volume Overflow when the early-warning
position is encountered during write operations.
EEG 10 4 Not supported, must be set to 1
SEW bit 10 3 If the Synchronize at Early-Warning (SEW) bit is set to 1 (the default
value), it causes the drive to flush all buffered write data to tape when
the early-warning position is encountered during writing.
Medium Partition Page (11h)
The Medium Partition page specifies the number and size of partitions to be created
on the medium. The layout of this page is shown in the following table.
Byte
Bits
7 6 5 4 3 2 1 0
0 0 0 | Page Code (11h)
1 Page Length (06h)
2 Maximum Additional Partitions
3 Additional Partitions Defined
4 0 SDP IDP | PSUM | 0 0 0
5 Medium Format Recognition
6 0 0 0 0 0 0 0 0
7 0 0 0 0 0 0 0 0
8 MSB—Additional Partition Size
9 Additional Partition Size—LSB