I bought a 512GB FF911 USB
I bought a 512GB FF911 USB. Excellent performance at first but it died after 6 weeks after periods of erratic behaviour. CrystalDiskInfo showed 0 valid blocks available. Replacement lasted 50% longer at 9 weeks but died with the same error. I requested a refund on 21/3/25 but only received a generic list of things to try, including low level format. Given that new units lasted between 6 to 9 weeks and failed with almost total loss of data I didn't expect reliability from a reformatted failed unit. After the failure of the second unit I tested it with various utilities including CHKDSK and HD Tune Pro 6.0 (quick scan) which both pronounced it healthy. A full scan with the latter found 17 individual bad blocks before condemning the rest. Two weeks since the last (generic) reply and counting. Five year warranty not looking so great!