[Avid-L2] one NTFS drive not read by Mac, but another one is?

I picked up a 1TB Lacie external from a client on Tuesday, they had captured all of the material onto it for me etc. The drive is formatted NTFS, I'm on a Mac. My intent was to copy all of the media files over to my RAID on my Mac and put their drive on the shelf until I am through with it.

I know that Macs can read NTFS (and to write to NTFS I use Paragon), however when I plugged in their drive to my system I got the message: "The device could not be read by this computer" and I was given choices to Initialize, Ignore or Eject.

I plugged the drive into my PC and it read it just fine. I plugged another of my own NTFS externals into my Mac and that drive was read just fine. Ultimately, I copied the contents off of the client drive onto my own NTFS drive, then plugged that one into my Mac and copied the files - my mac and PC are no longer networked, in case anyone is wondering.

But, my main question is what could be different about the client drive that would prevent my Mac from seeing it? Oh, and it did appear in Disk Utility. When I Verified the disk, it came back reporting an error and suggested I Repair. But, Repair was grayed out.

I believe the client is on Vista, so I'm not sure if when they formatted it Vista might have locked it down or something, but it certainly made for an interesting couple of hours as I tried to figure out what was going on. Anyone else see anything like this?

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