Thanks for the sage advise vibration888. I'm sure DiskWarrior is as good as you say but what good is it if it's a hardware compatibility issue? I will heed your advise on buying different brands in the future but as I own both a 2TB and a 3TB v3 d2 quadra I'd like to get them working. The thought of swapping hard drives from one case to another honestly freaks me out a little because I'm not a techie guy with computers. Thats why I like Apple products...they usually just work.
Anyway, my issues are a bit different and I was hoping someone might be able help as LaCie and Apple haven't.
I'm running a mid 2010 Mac Pro with dual 2.4 quads, OS 10.7.5
I bought the 3TB d2 to backup raw video files from P2 cards but soon after I started using it the FW800 transfers usually failed with an error stating the "file **** was in use" after which the drive would get really buggy and unresponsive. If the d2 was off prior to the transfer it would usually work ok but if it'd been on for say an hour already then it would always fail. I don't ever freeze or hangup but sometimes the Mac won't shut down properly and I need to kill it with the power button.
I contacted Lacie and they told me to back it up and reformat it so I bought the 2TB d2. The first time I plugged it into the Mac Pro via FW800 it wouldn't mount. I took it back and exchanged it for a different drive and had the same result so I plugged it into my 2004 iMac with a FW800 to FW400 converter cable I fortunately had and it mounted right away. I reformatted the 2TB d2 with disc uitlity, plugged it into the Mac Pro and it mounted.
While transferring the many of gigs of files from the 3TB to the 2TB I kept getting the same "file **** in use" error/failure so I unplugged the FW800 and used the USB 3 cables that came with the d2's and plugged it into the USB2 port on the Mac Pro. Everything transferred fine via USB so I reformatted the 3TB and repatched both the drives to FW800 thinking my problems were solved but still the same error occured while transferring to or from the d2's, "file****in use"
Following Lacies advice I tested the drives on a friends new iMac with FW800 and they worked fine so I called Apple. After running the standard trouble shooting procedures over the phone they booked me an Apple Store appointment where it was decided the easiest thing to do was to replace the backplane board. Great I'm thinking, that should solve everything. Ha, apparently I'm too optimistic because nothing changed with the FW800 issue.
That was a couple of weeks ago and I've been using the drives with USB until I had time and energy to revisit this craziness. Tonight I dusted off my old Power Mac G5 with a single FW800 port and daisy chained the d2's together and copied one 152GB folder and one 114GB folder from the 3TB to the 2TB with no issues.
I know LaCie is going to say it's an Apple issue since the drives work on another Mac, but from what I've read in this thread Apple hasn't recognized this publicly and there is no solution on the horizon.
So if anyone has any suggestions I'd love to hear them. If not maybe I can find a YouTube video that illustrates how to swap the d2 hard drives into new cases.