DLT not readable by replicator

Hi All, I have a dual-layer project, authored in DVDSP3, that we have submitted to our replicator three different times. They say they can't mount or read our tapes.
I receive no error messages when writing the DLT tapes from DVDSP and I can mount the image from DLT on our system after they are written, so I know the image is there. We have tried a couple different formats, CMF and DDP2.0.
Any ideas of why we can read the data but they can't?
Thanks in advance.

I will go through and double-check some of these things. I have successfully sent DLTs to this vendor in the past, starting with DVDSP 1.5. Because I'm writing from DVDSP I have assumed compression isn't an issue, but I'll check. I have also used the approved file formats from the replicator, DDP or CMF. I will probably run new tapes in every flavor to take to them for a test.
This batch of DLTs are type-IV tapes. I will see if I can get hold of some type-III as well. I'll have to see how I can slow down the drive.
Again, the oddest thing is the tapes are good. I can mount the volume from both layers and everything works perfectly. There is not a problem with the data, at least when it is read back on one of our systems. So it is an incompatibility issue, not a real writing issue.
I have a date with the tech guys next week. I hope to take them several samples trying these suggestions. I was hoping for a known bug or something! Guess I have more work to do...
Thanks for the help. If anything else comes to mind, I'd love to hear it.

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NEW FIRMWARE: Try updating your external hard drive's firmware, which is available from your drive manufacturers Web site--or just use VersionTracker's (www.versiontracker.com) search function to find it. Be sure to back up your data before applying the update, and carefully follow the manufacturers instructions.
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