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".
Dell EMC 092GD6 Broadcom 9305-16i LSI Quad Port 4 Port SAS RAID Controller
$84.99
ASUS Hyper M.2 x16 Gen 4 RAID Card- Used Working
$32.95
Sans Digital 2 Bay SATA to eSATA/ USB 2.0 RAID JBOD
$79.35
OWC Guardian Maximus Raid Enclosure SATA Hard Drive FireWire
$36.99
Dell PERC H330 PCIe 3.0 x8 RAID Storage Controller 4Y5H1 High Profile
$17.99
Dell H310 SATA SAS RAID Controller Card - HV52W with 1 SFF-8087 Cable, IT Mode
$20.00
LSI 8 Port 6Gbps PCIe 3.0 External SAS RAID Card w/ 1GB CacheVault & Low Profile
$24.65
LSI MegaRAID 9361-8i 12Gbps PCIe 3 x8 SATA SAS 3 8 Port RAID + BBU & CacheVault
$39.00
Yottamaster 5 Bay RAID Hard Drive Enclosure Type-C B For 2.5" 3.5" SATA HDD SSDs
$131.59
Yottamaster 2 Bay RAID Hard Drive Enclosure USB 3.1 Type B For 3.5" SATA HDDs
$69.91