Original sentence: A logical unit is a SCSI protocol entity, the only one which may be addressed by the actual input/output (I/O) operations.Each SCSI target provides one or more logical units, and does not perform I/O as itself, but only on behalf of a specific logical unit.In computer storage, a logical unit number or LUN is simply the number assigned to a logical unit
Edited sentence: A logical unit is a SCSI protocol entity which performs classic storage operations such as read and write.A logical unit typically corresponds to a storage volume and is represented within an computer operating system as a device.Each SCSI target provides one or more logical units.In computer storage, a logical unit number or LUN is the identifier of a SCSI logical unit.Though by strict definition, a LUN is an identifier, the term "LUN" is often used for a logical unit itself