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I've just got HDTune, and run the benchmark. Posted ss of that and health tab. Not sure what else is needed, will update as requested

toshiba dt01aca050

Done a full scan with Windows Defender (which took 19 hours total), ran HijackThis and analyzed, as well as CCleaner. Nothing suspicious turned up in any of the above.

Disk usage back to 100%...

Got Driver Easy, updated everything, including SATA/AHCI (and a number of other things i wouldn't have figured), restarted, but still no change. Boot time is still pretty crazy

Hm. Checked on that very thing, and you were right of course.

It also seems my disk read/write is still misbehaving, though. Startup boot, and the load times of several programs are still...

Okay, so

Lately I've had crazy boot and load times, and what appeared to be disk issues (usage was 100%, read/write was little-to-none). Disabled a few things in services.msc (superfetch and...