I don't see this device being all that useful for hibernate wake-up, but it is interesting if the 256MB just acts as a persistent write-cache. Often in linux the hard drive never spins down, because things are constantly being written (log files, atime updates on the FS, etc). This can be reduced by using laptop-mode (and mounting -o noatime ) for the filesystem, but then you run the risk of losing data if the system dies and nothing has been synced with disk for a long time. And the last thing you want to do is spin up the disk every 10-15 mintues(because of the wait, power, and wear from this), but you need to to keep the filesystem consistent. But with 256MB of write space, that doesn't require the disk to be spun up, that is synced with the "real" disk when it *is* spun up (for reading uncached stuff probably) would make for a large power savings on systems that have enough RAM to keep everything in memory. I guess linux can take advantage of that immediately, with no special tweaks, if the drive is doing everything. But I have read other articles that say that you need Vista to take advantage of this drive.