The information in this article applies to:
- Microsoft Windows NT operating system version 3.1
- Microsoft Windows NT Advanced Server version 3.1
- Microsoft Windows NT Workstation version 3.5
- Microsoft Windows NT Server version 3.5
SYMPTOMS
Windows NT Backup may stop responding (hang) when you restore a backup set
on a Compaq five gigabyte tape drive. This problem occurs when compression
was used to backup.
CAUSE
This problem occurs because of a problem in the compression chip on some
Compaq five gigabyte tape drives manufactured between January 1994 and
April 8, 1994. If the problem is caused by the compression chip, Windows NT
Backup hangs at the same point every time you attempt to restore the backup
set.
MORE INFORMATION
To determine if your Compaq drive has a faulty compression chip:
- Determine if you have a suspect chip through visual inspection.
Look at the underside of the tape drive; the compression chip is
located on the underside of the printed circuit board. Any compression
chip with the following marking has the problem:
_______________________________________________
| |
-| |-
-| A A TM |-
-| AAHHH HHHAAA |-
-| AA HHH HHHA AA |-
-| AAAAHHHHHHHHAAAAA |-
-| AA HHH HHH AA |-
-| AA HHH HHH AA |-
-| |-
-| AHA3101A |-
-| 020PQC |-
-| |-
-| 1XH4-0301 |-
| YYWWD - <country/region of origin> |-
| XXXXXXXX |-
\_____________________________________________|
| | | | | | | | | | | | | | | | | | | | | |
XXXXXXXX is the lot number. Chips without the lot number do not have
the problem.
NOTE: YYWWD is the date code. The country/region of origin could be
Japan, Singapore, Korea, or Taiwan.
- If your tape drive has a lot number, obtain and use SRAM Tape Test Kit.
Compaq created an SRAM Tape Test Kit to allow you to determine if your
specific chip is faulty. The kit contains one DAT test tape with usage
instructions. If you have any questions or need to obtain the SRAM test
kit, contact Compaq Support at (800)345-1518.