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DC6525 Tapes

Trish's Escape from Hardware Hell Help Board » Hardware » Hard Drive and Storage Related » DC6525 Tapes « Previous Next »

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Posted on Wednesday, February 20, 2002 - 10:25 pm:   

A long time ago we used to make backups to DC6525 tapes and we have a number of these in the office. At that time we used an internal SCSI Wang 5525ES tape backup unit. The problem is that we now have no tape backup unit with which to retreive all this good information. My questions are as follows:
(1)What makes and models of Tape backup units will read and write to these DC6525 tapes.
(2)Do I have to worry about different tape backup protocols or should any physically compatable tape backup unit be capable of doing the job?
(3)Can I buy a used internal SCSI Wangtek 5525 tape backup unit, mount it in an external case and connect up using a scsi connector? What would be the problems and pitfalls with this approach?
Posted on Thursday, February 21, 2002 - 7:20 am:   

Archive Anaconda 2750
The boot message identifier for this drive is "ARCHIVE ANCDA 2750 28077 -003 type 1 removable SCSI 2"

This is a QIC tape drive.

Native capacity is 1.35GB when using QIC-1350 tapes. This drive will read and write QIC-150 (DC6150), QIC-250 (DC6250), and QIC-525 (DC6525) tapes as well.

Data transfer rate is 350kB/s using dump(8). Rates of 530kB/s have been reported when using Amanda

Production of this drive has been discontinued.

The SCSI bus connector on this tape drive is reversed from that on most other SCSI devices. Make sure that you have enough SCSI cable to twist the cable one-half turn before and after the Archive Anaconda tape drive, or turn your other SCSI devices upside-down.

Two kernel code changes are required to use this drive. This drive will not work as delivered.

If you have a SCSI-2 controller, short jumper 6. Otherwise, the drive behaves are a SCSI-1 device. When operating as a SCSI-1 device, this drive, "locks" the SCSI bus during some tape operations, including: fsf, rewind, and rewoffl.

If you are using the NCR SCSI controllers, patch the file /usr/src/sys/pci/ncr.c (as shown below). Build and install a new kernel.
*** 4831,4835 ****

! if (np->latetime>4) {
** Although we tried to wake it up,
--- 4831,4836 ----

! if (np->latetime>1200) {
** Although we tried to wake it up,

Reported by: Jonathan M. Bresler

This is the only drive I recall that will work with the DC6525 tape besides the Wangtek, If you can find a used Wangtek go with it.. The Anaconda is quirky but fast for a tape drive and does give another option.
You should have no trouble using either an external kit/adaptor.
Malcolm Freeman
Posted on Friday, February 22, 2002 - 10:21 pm:   

Thanks for the information.
[1] I have located and bought a SCSI Wangtek 5525 ES internal tape drive. Will this tape unit read my 1/4 inch data cartridges? The data cartridges are DC6520 and DC 6525. I do not know if the data cartridges are QIC-250 or QIC-525.
[2] I plan on installing the SCSI Wangtek 5525 ES internal tape drive in an old Wang Tapeport 500 case. Do you forsee any problems with this?
[3] I will then connect the tape drive to my Dell desktop using the Adaptek SCSI card & cable which I already have installed on my computer.
[4] Will Microsoft windows 98 detect and supply the appropriate drivers for this SCSI tape drive?
Posted on Saturday, February 23, 2002 - 8:38 am:   

As long as the SCSI drive is configured/terminated properly and the SCSI card picks it up. It will work fine. Depending on your version of Win98 the native drivers should work fine. Your DC6525 tapes are the same as QIC-525.

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