Technical data

7.6 USB

ally the option Cooling break (5.9.2 General options) for the concerned device. The deletion

process then takes a bit longer, but in most of the cases the data transfer functions better.

Note: The described problems are mostly due to deficient hardware and also occur under

other operating systems. We recommend you to have the concerned device replaced.

7.6.3 Controller not found

HDShredder should recognize all current USB controllers which offer one of the USB standard

interfaces (3.5.2 UHCI, OHCI and EHCI). If HDShredder recognizes USB devices on one PC

but not on another PC or on another controller, the USB controller can have one of the follow-

ing problems:

• The USB controller does not comply with the UHCI, OHCI or EHCI standard. In this case, use

another, compatible (3.5.2 UHCI, OHCI and EHCI) USB controller.

• The USB controller is deactivated, e.g. in case of an onboard USB controller. Activate the USB

controller via the BIOS setup.

• The USB controller does not function correctly or is defective. Use another USB controller or

another PC for the deletion process.

7.6.4 Speed loss

USB controllers can have a negative effect on the speed of the whole system. This particularly

affects the deletion speed of all device types (also IDE and SCSI), even if no USB storage

device is connected. Remove or deactivate the corresponding USB controller if it is not

needed during the use of HDShredder. Otherwise, there are no negative effects apart from the

speed loss.

Note: In our tests, this problem showed up with only one USB controller (VIA VT6212) and

also persisted on other computers and operating systems with this controller. The measured

speed loss on the PCI bus was at about 40% (!).

7.6.5 Other controller problems

Another problem is an incompatibility with certain USB storage devices caused by the USB

controller. Especially older USB devices do not function flawlessly with such USB controllers.

Use another USB controller, if possible.

Note: In our tests, this problem showed up with only one USB controller (Acer ALi M5273)

and was also reproducible on other computers and operating systems.