Data Recovery and Digital Storage Glossary
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- SCSI
Small Computer System Interface. A means of attaching devices (such as Zip® drives, Jaz® drives, scanners, etc.) to your computer. There are various types of SCSI connectors:
- SCSI-1 allows the user to connect up to 7 devices at transfers data at 5 MB/s.
- Fast SCSI-2 allows the user to connect up to 7 devices at transfers data at 10 MB/s.
- Ultra SCSI (also know as Ultra Narrow SCSI) allows the user to connect up to 7 devices at transfers data at 20 MB/s.
- Ultra SCSI Fast and Wide allows the user to connect up to 15 devices at transfers data at 40 MB/s.
- Ultra 2 SCSI allows the user to connect up to 15 devices at transfers data at 80 MB/s.
- Ultra 160 SCSI allows the user to connect up to 15 devices at transfers data at 160 MB/s.
- SCSI-1 allows the user to connect up to 7 devices at transfers data at 5 MB/s.
- Sector
The smallest unit that can be accessed on a disk. When a disk undergoes a low-level format, it is divided into tracks and sectors. The tracks are concentric circles around the disk and the sectors are segments within each circle. For example, a formatted disk might have 40 tracks, with each track divided into 10 sectors. The operating system and disk drive keep tabs on where information is stored on the disk by noting its track and sector number. Modern hard disk drives use a technique called zoned-bit recording in which tracks on the outside of the disk contain more sectors than those on the inside. A sector that cannot be used due to a physical flaw on the disk is called a bad sector.
- Session
A collection of one or more tracks. Each recording procedure generates a session that contains all the tracks recorded at that time. A CD recorded in multiple recording sessions is known as a multisession CD.
- Session-At-Once
Session-at-once is similar to disc-at-once. The CD recorder writes an entire session without turning off the laser, but does not close the disc. Additional sessions may be written later. Session-at-once is intended for use when creating discs in the CD Extra format.
- Source
This is where the information is copied from. It may be a disc or location on a hard drive. A source drive is a CD-ROM or CD-R/RW drive, which is holding the disc that contains the information you want to copy.
- SP-DIF
Sony and Philips Digital Interconnect Format. A pair of stereo channels that can support sample rates up to 48 ksps (kilo-samples per second) with precision up to 24 bits. Your Iomega drive may have a SP-DIF connector (depending on the model), but does not include a cable. Many sound cards do not support SP-DIF.
