[Skunkworks] Read-Only Filesystem on Linux

Good People(and Bad ones as well), I got a read-only file system error on one of my hardisks on a Linux box and quickly switched to root and did 'mount -o remount,rw /where/i/wanted/it/to/be/mounted/ ' but I keep getting the error 'mount: block device /dev/sdb2 is write-protected, mounting read-only' . I have also tried to unmount it so that I mount it afresh, i.e 'umount /where/it/was/mounted/ but I get the error 'umount: /where/it/was/mounted/: device is busy' ! Is there something i'm missing here? -- Kind Regards, Moses Muya.