I recently purchased a WD Sharespace NAS with a whopping 4TB of RAID 5 storage, given the size of the files from my newly acquired Beyonwiz I figured an off-pc store would be ideal. Three weeks into service one of the HDD's failed and the RAID continued to perform in "degraded" mode pending the defective drive being replaced. After several emails to and from WD support (staffed by Kindergarden dropouts) in which they were/are clearly on their own learning curve, I finally reinstalled my brand new HDD into the unit and performed a recovery in accordance with the WD tech support instructions - the unit recovered the full RAID array and presented me with a fully restored and ready to go unit sans data.!!! That's right, if you have a drive failure and then replace the drive the unit will restore the datastore to the factory state - blank! The unit deletes all user created shares as part of the recovery process, so if you have created a custome share or folder and placed data in it, then backup first, because the idiotic WD coding will zap everything. The point of RAID is redundancy, but not if its a Western Digital, they have their own idea of what the RAID5 specification is all about, there you go - backup your redunant device - what is the point (I think the concept is lost on the boffins at Western Digital) Bottom Line: If you value your data - do not use Western Digital. Looks like the official response from Western Digital is to hide and say nothing. A great way to treat a customer that has just spent over $1000+ on their product. Lab test: To be sure it wasn't me, I have just finished trying to repeat the error by reinstalling the drive, syncing and then creating shares "Upload" and "Cabinet" - I populated the shares with a few hundred meg of files and pulled drive #3. The NAS then dropped into "degraded mode", I reinstalled the drive (after formatting) and then selected the "clear drive" option from the NAS control interface, the drive then presented as "new", I then re-synced as per the instruction from the WD support team, and hey presto - exactly the same result, a perfectly clean and blank drive, all shares deleted by the OS. DUMB, DUMB, DUMB - Bad Firmware, Bad Coding. Violation of the RAID-5 specification (see re-sync). I doubt WD will ever formally respond, but steer clear of this unit if you need a truly redundant NAS, get something else.