Hi! I am running a dual-boot Mac with Windows 7 and Snow Leopard. My problem concerns two external Lacie Quadra drives at 1 tb each named T1 and T2. History: Had T1 a year - maybe Got T2 on warranty replacement in November T2 went first with a B mode error within two weeks of receiving it. Since it was my back-up drive's backup, no worries. Formatted and started over. Ran fine for maybe five - six weeks then crapped out again. Would show up on desktop sometimes with major files missing. Turned it off and investigated file recovery options. T1 went within three days of T2. It was throwing invalid sibling something-or-another. Both drives when scanned with Tech Tools Pro were unrepairable with bad superblocks/magic numbers. Using terminal to specify alternate blocks did not work. :/ Repaired T2 last night with DiskWarrior. Lost some files but got the important ones back. Working on T1 now. Known issues: had a problem with a driver on the windows side that would cause Windows to bluescreen (only sometimes - arg) when I tried to use my external drives with Firewire. Drives were fine with USB connections. The actual questions: Now what? Do I need to use a third drive to drag off what I can save and reformat both T1 and T2? Is a repaired drive/directory reliable? I don't know a whole lot about how HFS+ works regarding file storage and access, but can repeated power failures (i.e. bluescreen events) cause this? T1 went out after I replaced the driver that was causing the fault, but I believe I read somewhere that directory errors can start out small but escalate until the drive is unusable. Is this true? My system: 2.4 ghz / 4g ram / 10.6.3 Windows 7 / Macdrive Errors occurred under 10.5.something; upgraded to Snow Leopard yesterday. Probably random details: 1) Upgraded to Win 7 form XP without Snow Leopard support. Found a work-around with the boot issue. The Mac side of my internal drive is fine, so I am assuming this is unrelated. 2) Have had problems with disappearing files for a long time. Some but not all were caused because I didn't realize that Macs REPLACED folders instead of merging them like Windows does. I have wondered how much (if anything) MacDrive may have had to do with this. 3) Internal drive also has a third 32g FAT partition for shared files. I set that up when I got this machine two years ago, and the internal partitions are still fine. No missing files from internal disks - only from external drives. Any insight into this would be greatly appreciated. I'm a little geeky when it comes to Windows, but Macs, well, they're different. (Duh, right? LOL) Thanks a million!!!!!!!!!