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Removable media bit (RMB)

A bit contained in the device response to the SCSI INQUIRY command (0x12) that indicates whether the media is removable (RMB=1) or fixed (RMB=0). Not to be confused with the Removable field of the DEVICE_CAPABILITIES used to indicate whether a PDO represents a hot-pluggable device, RMB refers to a property of the media rather than the device itself. Media for which RMB=1 is treated differently by the system than show media with RMB=0.

What about removable media?

Removable media must be MBR, GPT, or "superfloppy."

What is a superfloppy?

Removable media without either GPT or MBR formatting is considered a "superfloppy". The entire media is treated as a single partition.
The media manufacturer performs any MBR partitioning of removable media. If the media does have an MBR, only one partition is supported. There is little user-discernible difference between MBR-partitioned media and superfloppies.
Examples of removable media include floppy disk drives, JAZ disk cartridges, magneto-optical media, DVD-ROM, and CD-ROM. Hard disk drives on external buses such as SCSI or IEEE 1394 are not considered removable.