I used CrystalDiskInfo to test an HDD whose model name is WDC WD40NDZW-11A8JS1 4000,7 GB. To my surprise, it’s random write speed is whooping 12 mb/s, 24 times as fast as its random read speed. Not bad for an HDD! For reference, another HDD that I tested has double speed for every other test, but both of its random read and write speeds are at about 1 mb/s.
I’m scratching my head for why this particular model has such fast random write speed, and cannot find any such instance online. I tested it again a few hours later, and got a similar result.
