What drives does df query?
by RandomTroll from LinuxQuestions.org on (#50RMG)
When I run df, I get Quote:
Why does df query /usb? It was mounted on /dev/sdb1, but that device is now absent, had been properly unmounted. There was an entry for /usb in /etc/mtab, but I deleted it. When I attach a usb device, it gets /dev/sdc, so the system thinks /dev/sdb isn't available.
| df: /usb: Input/output error |