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 Catalyst 3650 48-Port Managed PoE+ Gigabit Switch WS-C3650-48FS-E
$55.99
Cisco 2900 Series CISCO2911/K9 Integrated Services Router
$46.74
Cisco WS-C3850-48P-L 48-Port Gigabit 3850 PoE Switch w/ 715W+ C3850-NM-4-1G Mod
$83.00
Cisco C3850-NM-2-10G 2 Port Network Exp.Module for 3850
$38.99
Cisco Catalyst WS-C2960-48TT-L V02 48 Port Fast Ethernet Switch
$34.00
Cisco CBS350-24FP-4G 28 Port PoE Managed Ethernet Switch
$319.99
Genuine Cisco SFP-10G-SR V03 10GBASE-SR SFP+ Transceiver Module 10-2415-03
$8.00
Cisco C9300-48 48 Port Switch Dual PSU W/C9300-NM-8X P/N: C9300-48U-A Tested
$799.99
UNCLAIMED Cisco Meraki MS120-24P-HW - 24Ports Ethernet PoE Switch Same Day Ship
$315.00