Table of Contents
Advertisement
ARCHIVE PYTHON DDS·DC OAT DRIVES···PRODUCT DESCRIPTION MANUAL
Host Interface Type and Address (Bytes 224-255): The type of host interface and its connection may
appear here. (Bytes 224-239
=
type; bytes 240-255
=
address). This field is an ASCII string (null terminated
and padded).
Bytes 400 - 5755 are reserved and are set to ASCII null character.
Vendor Unique (Bytes 5756-126631): Contents not specified.
6.11 Read-After-Write
The Read-After-Write (RAW) technique provides a means of verifying that host data was written on the tape
correctly by reading it later. After each frame is written, it is examined to determine whether or not it is
correctly recorded.
If
a frame is identified as bad, it is rewritten later down the tape. The bad frame is not necessarily rewritten
immediately. It can be rewritten after three, four, or five other frames have been written. Any frame can be
rewritten multiple times to provide for skipping over bad areas on the tape. The maximum number of times a
rewrite sequence can occur is 128 (original plus 127 repeats).
6-16
Advertisement
Table of Contents
