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 24 Port Gigabit Ethernet Switch w/ 2 x SFP SG110-24
$117.00
BROCADE 57-0000089-01 Brocade 16G LWL 10KM FC SFP XBR-000198 XBR-000199
$29.00
QK724A HP B-SERIES 16GB SFP+ SHORT WAVE TRANSCEIVER 656435-001
$9.50
GENUINE CISCO DS-SFP-FC32G-SW SFP NEW SEALED SEE PHOTOS SHIPS FREE
$74.99
Genuine Cisco SFP-10G-SR V03 10GBASE-SR SFP+ Transceiver Module 10-2415-03
$8.00
For Cisco SFP-10G-T, Ubiquiti UF-RJ45-10G Module 10G SFP+ to RJ45 10GBase-T
$48.59
FS SFP-10G-T, 10GBASE-T SFP+ Copper RJ-45 30m Transceiver Module
$50.00
GENUINE Cisco SFP-GE-T EXT 30-1421-01 USA 1000BASE-T RJ45 SFP Transceiver
$9.99
NEW Sealed Cisco SFP-10G-SR-S 10G SR SFP+ Module 850nmMM *US Shipping*
$15.00
Lot (10) Dell 0N8TDR 850nm SFP-10G-SR-85C 10Gbs sfp+ FTLX8574D3BNL-FC N8TDR NEW
$68.00