I've noticed that if I use a persistent image file and for some reason it gets corrupted (powering off abnormally) that I'll get a bunch of filesystem errors in dmesg. I can fix it by booting with the "noimage" cheat code, like "knoppix64 2 noimage" and then run "fsck.ext2 /mnt-system/KNOPPIX/knoppix-data.img" and then "sudo reboot".
It'd be really nice if there were an automatic check of the ext2 image when knoppix boots. It would also let you know if errors have crept into your filesystem since knoppix still works but you see weird messages like "unable to write /etc/fstab".
N85XX DELL 3.84TB SAS 12GB/S ENTERPRISE SOLID STATE DRIVE (W/ 14TH GEN CADDY)
$389.95
Western Digital 1TB WD Blue SA510 SATA SSD Internal 2.5”/7mm Cased - WDS100T3B0A
$89.99
Western Digital 250GB WD Blue SA510 SATA SSD, Internal M.2 2280 - WDS250G3B0B
$39.99
WD 500GB My Passport SSD, Portable External Solid State Drive WDBAGF5000ARD-WESN
$59.99
Patriot P210 128GB 256GB 512GB 1TB 2TB 2.5" SATA 3 6GB/s Internal SSD PC/MAC Lot
$14.99
Micron 5100 MAX 120GB SATA 6Gb/s 2.5" Internal SSD MTFDDAK120TCC Solid State
$9.89
Netac 1TB 2TB 512GB Internal SSD 2.5'' SATA III 6Gb/s Solid State Drive lot
$13.99
Fanxiang SSD 512GB 1TB 2TB 4TB 2.5'' SSD SATA III Internal Solid State Drive lot
$13.99
M.2 NVMe SSD 128GB 256GB 512GB Single Notch with Windows Installed 10 / 11
$85.25
Fanxiang M.2 SATA SSD 2TB 1TB 512GB 256GB SSD Internal M2 Solid State Drive Lot
$109.99