There seems to be some luck booting up, then putting in the usb drive.
Dear board!
Be aware, my Knoppix/Linux knowledge is not yet a whole day old. That's it exactly why I would be really grateful for some help.
Problem: Boot Knoppix 3.6 with USB devices on a notebook Travelmate 720TX. I've tried Sandisk Cruzer mini (Yes, I have read what I found, i.e. Cruzer problems are well-known in your community, however, there also are some work-arounds offered) and some no-name extern hdd. Cruzer and hdd work fine under that different, you know what I mean, OS.
Findings: There appears a general problem while booting:
Scanning USB/Firewire ... Done.
Enabling DMA: hda
Enabling DMA: hdc
Accessing cdrom at /dev/scd0
Setting paths... usb_control/bulk_msg: timeout
usb.c: USB device not accepting new address=3 (error=-110)
Memory found ....
Ramdisk ...
...
APM Bios found, powermanagement functions enabled.
And then the boot freezes.
Trials: Found that it has something to do with my EZ PC Card 10, which is a pcmcia network card. So either removing the card or using the boot command 'knoppix pcmcia' work fine: I'll get the desktop, where I can easily access my hd1. But no usb-device can be seen.
I'll be glad for any help and naturally ready for giving you any additional information you want. Many thanks.
There seems to be some luck booting up, then putting in the usb drive.

Intel Core i5-12500T SRL5W 2GHz 18MB 6 Core Socket LGA1700 Desktop CPU Processor
$114.99
(LOT OF 20) Intel Core i5-8400 CPU 2.80GHz Desktop Processor (SR3QT)
$700.00
INTEL CORE I9-10940X X-SERIES PROCESSOR | 3.30GHZ | SRGSH
$179.99
Intel Core I9-14900K 14th Gen Desktop CPU Socket LGA 1700
$320.00
Intel Core i7-9700 Octa-Core 3 GHz Desktop Processor LGA 1151
$79.99
Intel Core i7-3770K 3.5 GHz Processor
$39.00
Intel Core i7-9700K Octa-Core 3.6 GHz Desktop CPU
$99.99
Intel Core i5-14600KF Unlocked Desktop Processor
$259.99
Intel Core i7-4770 3.40GHz Quad Core SR149 LGA 1150 CPU Processor tested
$35.00
Compo MSI B150I GAMING PRO AC LGA1151 16 Gb DDR4 + Cpu I7 6700+I/O Shields.
$159.00