Can someone help me sort out why I get an error message trying to mount an ntfs volume - "ntfs-3g: Failed to access volume '/dev/sdb1' : no such file or directory."

This device can be listed by fdisk -l
Disk /dev/sdb: 120.0 GB, 120034123776 bytes
255 heads, 63 sectors/track, 14593 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x0dcdd036

Device Boot Start End Blocks Id System
/dev/sdb1 * 1 14592 117210208+ 7 HPFS/NTFS