My 'new' computer stopped booting. I pulled out my old computer, put the disk from the new computer in the USB-SATA adaptor, and it won't mount, complaining dmesg includes this comment a few lines before. The disk from the new computer is SSD; my old computer has only used HDDs. I don't want to harm the SSD by 'fixing' it unnecessarily. It passed e2fsck Saturday, has every time I have tested it, which is almost daily. Have I missed something?

The new disk is a Samsung PM871A, 512 GB. The main disk on the old computer is a 512 GB HDD.

RandomTroll,

Have a look at this previous LQ thread:
https://www.linuxquestions.org/quest...5/#post4326339

Posts #13 and #14 suggest using:

Don't use any USB adapter for NVMe-/SATA-/IDE-/SCSI-drive diagnostics. USB = "Useless Serial Bus" for drive diagnostics. Many drive diagnostic programs don't work with "USB drives".

Disconnect all SSDs/HDDs from mainboard & add-in-cards in your old computer.
Connect your iffy SSD with mainboard (if possible) or SATA add-in card in your old computer.
Boot a live Linux from USB stick or DVD.
Run diagnostic programms, start with smartctl.

1 members found this post helpful.

This has been my experience often. I also find I can't boot off a drive attached USBly when it will boot when installed. My old computer is a laptop, with only 1 place to install a drive internally, so I have to take the old one out to install the new one. But when I did it works, so it was the USB-ness that made it appear bad. I'm glad I didn't try to 'fix' it.