bash-3.2# rmformat -l
Looking for devices...
     1. Logical Node: /dev/rdsk/c0t1d0p0
        Physical Node: /pci@0,0/pci-ide@6/ide@0/sd@1,0
        Connected Device: TSSTcorp CD/DVDW SH-S182D SB03
        Device Type: DVD Reader/Writer
        Bus: IDE
        Size: 681.6 MB
        Label: <None>
        Access permissions: Medium is not write protected.
     2. Logical Node: /dev/rdsk/c4t0d0p0
        Physical Node: /pci@0,0/pci1043,8234@2/storage@4/disk@0,0
        Connected Device:          USB FLASH DRIVE  PMAP
        Device Type: Removable
        Bus: USB
        Size: 984.0 MB
        Label: <None>
        Access permissions: Medium is not write protected.
bash-3.2# rmformat -F long /dev/rdsk/c4t0d0p0
Formatting will erase all the data on disk.
Do you want to continue? (y/n)y

bash-3.2# mkfs -F pcfs /dev/rdsk/c4t0d0p0

Device /dev/rdsk/c4t0d0p0 was assumed to be a diskette.
A diskette specific operation failed on this device.
If the device is a hard disk, provide the name of the full physical disk,
and qualify that name with a logical drive specifier.

Hint: the device is usually something similar to

/dev/rdsk/c0d0p0 or /dev/rdsk/c0t0d0p0 (x86)
/dev/rdsk/c0t5d0s2 (sparc)

The drive specifier is appended to the device name. For example:

/dev/rdsk/c0t5d0s2:c or /dev/rdsk/c0d0p0:boot

bash-3.2#