Istvan Gabor wrote:

Hello:

The system is OSS 10.0 i386. I have problems to mount some usb pendrives, some work fine. The message I get when I want to mount is:

Could not mount device. The reported error was: mount: special device /dev/sda1 does not exist

However other pendrives are recognized correctly. May be important that my computer has only USB 1.0 controller.

How could I fix this issue?

I have recently had the same experience, with both a pen drive and an external hard drive, both of which worked previously. However, both still work on another computer. Both computers are running 10.0, with all the latest YOU updates. I haven't found the cause of the problem yet.