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".
Cisco SG110 8 Port Gigabit Ethernet Switch SG110D-08-UK
$39.00
Cisco SG110-16HP 16-Port Gigabit PoE Unmanaged Switch SG110-16HP-NA
$108.00
Cisco 110 SG110D-05 5 Ports Ethernet Switch - 1000Base-X SG110D-05-EU-WS
$40.00
Cisco SG95-16 16-Port Gigabit Switch SG95-16-SG
$47.00
New Linksys SE3005 5-port Gigabit Ethernet Switch
$18.99
New 10/100 Mbps 8 Ports Fast Ethernet LAN Desktop RJ45 Network Switch Hub
$11.49
Netgear Prosafe GS724T V2 24-Port 10/100/1000 Gigabit Ethernet Network Switch
$27.99
NetGear ProSafe GS748T V4 48-Port Gigabit Smart Switch w/ Ears + Cord
$30.00
Juniper Networks EX3300-48P 48-Port PoE+ 4x SFP+ Network Switch w/ Power Cord
$43.95
Fortinet FortiSwitch FS-124D-POE 24 Port Gigabit Ethernet Switch UNREGISTERED
$99.97