The problems started in the spring when users saw Extreme-series portable SSDs bork themselves before their very eyes. A firmware update was supposed to fix things, but new complaints dispute its effectiveness.

Meanwhile, SanDisk has said nothing about the recent complaints and hasn't explained what caused the problems.

Four months of complaints have piled up on SanDisk's forums and Reddit. One tech press hack had two whole Extreme Pros die on him. Both times they filled about 50 per cent and then showed a bunch of read and write errors. Upon disconnecting and reconnecting, the drive was unformatted and wiped, and he could not fix either drive by wiping and reformatting.