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Plasma freezes during high disk activity (solved)
(discuss.tchncs.de)
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I had something similar when my drive started to fail.
At first, it was annoying, because the cursor froze all the time, just like yours, then programs started to do the same, then they started to crash without reason, and in the end, even my unbreakable OS (Fedora Atomic) broke randomy and incoherently.
What did I learn? Don't cheap out on drives, and keep enough backups.
Yeah, I'd be checking the smart stats on my drives and doing a full data backup if I didn't already have one.
The SMART didn't help. It showed full health and no errors.
While that's encouraging, I would still make a full backup of my data and have a plan to replace the drive while I investigated further.