Sure will easily loose your data if a power outage or a sudden disconnection happens.
How much does it take for it to dump the 1GB cache in case of disconnection?
Quite unsafe, despite a great idea.
1 Gb of RAM takes a long time to flush to disk, what happens when the power goes off? or there's a connection problem?
Great concept but someone didn't think this through, there's a reason drives aren't equipped with ginormous amounts of memory. I would only use it for stuff I don't care about or I have backed up elsewhere.
Many of the commenters here are reading it wrong. The cache is not read/write, its read cache. Power loss would dump the read cache, no data loss would occur as the original still exists on the drive. Increasing the ram to larger than 1GB could be beneficial though.