Recover data from LaCie 1TB NAS

Neil seems to have a problem with its 1TB LaCie NAS.

… Lacie NAS 1TB drive… I can’t even get a connection to it. I … put [the drive] into my computer using a free SATA port. … I can see the drive only in Disk Management…Windows tells me that there is 100% free space available…How can I possibly recover my data from this drive?

What Filesystem is Lacie using?

Last question first, LaCie uses EXT3 or XFS filesystem, depending on the exact model/firmware.

As far as recovery goes, we can do that, since this is a NAS version of the LaCie.  If it were a USB/Firewire/Thunderbolt version, we would have passed the opportunity. As it is, single drive NAS with EXT3 (or XFS) is pretty easy. The damage should be not that bad, because not being able to connect to the unit at all suggests some kind of instantaneous and total failure of either the unit itself or firmware in it. Such cases tend not to damage the filesystem, because there is no time to do the said damage.

As a side note, Disk Management does not show free space for EXT3, or any other Linux filesystem. It does not know how to read them, so it assumes all the space is free.