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Small Computer System Interface (SCSI, /ˈskʌzi/ SKUZ-ee)[1] is a set of standards for physically connecting and transferring data between computers and peripheral devices. The SCSI
SCSI
standards define commands, protocols, electrical and optical interfaces. SCSI
SCSI
is most commonly used for hard disk drives and tape drives, but it can connect a wide range of other devices, including scanners and CD drives, although not all controllers can handle all devices. The SCSI
SCSI
standard defines command sets for specific peripheral device types; the presence of "unknown" as one of these types means that in theory it can be used as an interface to almost any device, but the standard is highly pragmatic and addressed toward commercial requirements. The ancestral SCSI
SCSI
standard, X3.131-1986, generally referred to as SCSI-1, was published by the X3T9 technical committee of the American National Standards Institute (ANSI) in 1986. SCSI-2 was published in August 1990 as X3.T9.2/86-109, with subsequent revisions in 1994. Further refinements have resulted in improvements in performance and support for ever-increasing storage data capacity.[2]

Contents

1 History

1.1 Parallel interface 1.2 Modern SCSI

2 Interfaces

2.1 Parallel SCSI 2.2 Other SCSI
SCSI
interfaces

3 Cabling

3.1 SCSI
SCSI
Parallel Interface 3.2 Fibre Channel 3.3 Serial attached SCSI 3.4 iSCSI 3.5 SRP 3.6 USB Attached SCSI 3.7 Automation/Drive Interface

4 SCSI command protocol 5 Device identification

5.1 Parallel interface 5.2 General

6 Device Type 7 SCSI
SCSI
enclosure services 8 See also 9 Notes 10 References 11 Bibliography 12 External links

History[edit] Parallel interface[edit] SCSI
SCSI
is derived from "SASI", the " Shugart Associates
Shugart Associates
System Interface", developed circa 1978 and publicly disclosed in 1981.[3] Larry Boucher is considered to be the "father" of SASI and ultimately SCSI
SCSI
due to his pioneering work first at Shugart Associates
Shugart Associates
and then at Adaptec.[4] A SASI controller provided a bridge between a hard disk drive's low-level interface and a host computer, which needed to read blocks of data. SASI controller boards were typically the size of a hard disk drive and were usually physically mounted to the drive's chassis. SASI, which was used in mini- and early microcomputers, defined the interface as using a 50-pin flat ribbon connector which was adopted as the SCSI-1 connector. SASI is a fully compliant subset of SCSI-1 so that many, if not all, of the then-existing SASI controllers were SCSI-1 compatible.[5] Until at least February 1982, ANSI developed the specification as "SASI" and " Shugart Associates
Shugart Associates
System Interface;"[6] however, the committee documenting the standard would not allow it to be named after a company. Almost a full day was devoted to agreeing to name the standard "Small Computer System Interface", which Boucher intended to be pronounced "sexy", but ENDL's[7] Dal Allan pronounced the new acronym as "scuzzy" and that stuck.[4] A number of companies such as NCR Corporation, Adaptec and Optimem were early supporters SCSI.[6] The NCR facility in Wichita, Kansas
Wichita, Kansas
is widely thought to have developed the industry's first SCSI
SCSI
controller chip; it worked the first time.[8] The "small" reference in "small computer system interface" is historical; since the mid-1990s, SCSI
SCSI
has been available on even the largest of computer systems. Since its standardization in 1986, SCSI
SCSI
has been commonly used in the Amiga, Atari, Apple Macintosh
Macintosh
and Sun Microsystems
Sun Microsystems
(now part of Oracle Corporation) computer lines and PC server systems. Apple started using the less-expensive parallel ATA (PATA, also known as IDE) for its low-end machines with the Macintosh
Macintosh
Quadra 630 in 1994, and added it to its high-end desktops starting with the Power Macintosh
Macintosh
G3 in 1997. Apple dropped on-board SCSI
SCSI
completely in favor of IDE and FireWire with the (Blue & White) Power Mac G3 in 1999, while still offering a PCI SCSI
SCSI
host adapter as an option on up to the Power Macintosh
Macintosh
G4 (AGP Graphics) models.[9] Sun switched its lower-end range to Serial ATA (SATA). Commodore included SCSI
SCSI
on the Amiga
Amiga
3000/3000T systems and it was an add-on to previous Amiga
Amiga
500/2000 models. Starting with the Amiga
Amiga
600/1200/4000 systems Commodore switched to the IDE interface. Atari included SCSI
SCSI
as standard in its Atari MEGA STE, Atari TT
Atari TT
and Atari Falcon
Atari Falcon
computer models. SCSI
SCSI
has never been popular in the low-priced IBM PC world, owing to the lower cost and adequate performance of ATA hard disk standard. However, SCSI
SCSI
drives and even SCSI
SCSI
RAIDs became common in PC workstations for video or audio production. Modern SCSI[edit] Recent physical versions of SCSI‍—‌ Serial Attached SCSI
Serial Attached SCSI
(SAS), SCSI-over- Fibre Channel Protocol (FCP), and USB Attached SCSI (UAS)‍—‌break from the traditional parallel SCSI
SCSI
standards and perform data transfer via serial communications. Although much of the SCSI
SCSI
documentation talks about the parallel interface, all modern development efforts use serial interfaces. Serial interfaces have a number of advantages over parallel SCSI, including higher data rates, simplified cabling, longer reach, and improved fault isolation. The primary reason for the shift to serial interfaces is the clock skew issue of high speed parallel interfaces, which makes the faster variants of parallel SCSI
SCSI
susceptible to problems caused by cabling and termination.[10] i SCSI
SCSI
preserves the basic SCSI
SCSI
paradigm, especially the command set, almost unchanged, through embedding of SCSI-3 over TCP/IP, predominantly on Ethernet
Ethernet
which is also of serial nature. SCSI
SCSI
is popular on high-performance workstations, servers, and storage appliances. Almost all RAID
RAID
subsystems on servers have used some kind of SCSI
SCSI
hard disk drives for decades (initially Parallel SCSI, recently SAS and Fibre Channel), though a number of manufacturers offer SATA-based RAID
RAID
subsystems as a cheaper option. Moreover, SAS offers compatibility with SATA devices, creating a much broader range of options for RAID
RAID
subsystems together with the existence of nearline SAS (NL-SAS) drives. Instead of SCSI, modern desktop computers and notebooks typically use SATA interfaces for internal hard disk drives, with M.2
M.2
and PCIe
PCIe
gaining popularity as SATA can bottleneck modern solid-state drives. Interfaces[edit] Main article: SCSI
SCSI
connector SCSI
SCSI
is available in a variety of interfaces. The first was parallel SCSI
SCSI
(also called SCSI
SCSI
Parallel Interface or SPI), which uses a parallel bus design. Since 2005, SPI was gradually replaced by Serial Attached SCSI
SCSI
(SAS), which uses a serial design but retains other aspects of the technology. Many other interfaces which do not rely on complete SCSI
SCSI
standards still implement the SCSI command protocol; others drop physical implementation entirely while retaining the SCSI architectural model. iSCSI, for example, uses TCP/IP
TCP/IP
as a transport mechanism, which is most often transported over Gigabit Ethernet
Ethernet
or faster network links. SCSI
SCSI
interfaces have often been included on computers from various manufacturers for use under Microsoft Windows, classic Mac OS, Unix, Commodore Amiga
Amiga
and Linux
Linux
operating systems, either implemented on the motherboard or by the means of plug-in adaptors. With the advent of SAS and SATA drives, provision for parallel SCSI
SCSI
on motherboards was discontinued.[citation needed][11] Parallel SCSI[edit]

Two SCSI-2 connectors

Main article: Parallel SCSI Initially, the SCSI
SCSI
Parallel Interface (SPI) was the only interface using the SCSI
SCSI
protocol. Its standardization started as a single-ended 8-bit bus in 1986, transferring up to 5 MB/s, and evolved into a low-voltage differential 16-bit bus capable of up to 320 MB/s. The last SPI-5 standard from 2003 also defined a 640 MB/s speed which failed to be realized. Parallel SCSI specifications include several synchronous transfer modes for the parallel cable, and an asynchronous mode. The asynchronous mode is a classic request/acknowledge protocol, which allows systems with a slow bus or simple systems to also use SCSI devices. Faster synchronous modes are used more frequently. Other SCSI
SCSI
interfaces[edit]

Interface Alternative names Specification body / document Width (bits) Clock[a] Line code Maximum

Throughput Length[b] Devices[c]

SSA Serial Storage Architecture T10 / INCITS 309-1997 serial 200 Mbit/s 8b10b 20 MB/s[d][e][f] (160 Mbit/s) 25 m 96

SSA 40 T10 / INCITS 309-1997 serial 400 Mbit/s 40 MB/s[d][e][f] (320 Mbit/s) 25 m 96

Fibre Channel
Fibre Channel
1Gbit 1GFC T11 / X3T11/94-175v0 FC-PH Draft, Revision 4.3 serial 1.0625 Gbit/s 8b10b 98.4 MB/s[e][f] (850 Mbit/s) 500 m / 10 km[g] 127 (FC-AL) 224 (FC-SW)

Fibre Channel
Fibre Channel
2Gbit 2GFC T11 / X3T11/96-402v0 FC-PH-2, Rev 7.4 serial 2.125 Gbit/s 197 MB/s[e][f] (1,700 Mbit/s) 500 m / 10 km[g] 127/224

Fibre Channel
Fibre Channel
4Gbit 4GFC T11 / INCITS Project 2118-D / Rev 6.10 serial 4.25 Gbit/s 394 MB/s[e][f] (3,400 Mbit/s) 500 m / 10 km[g] 127/224

Fibre Channel
Fibre Channel
8Gbit 8GFC T11 / INCITS Project 2118-D / Rev 6.10 serial 8.5 Gbit/s 788 MB/s[e][f] (6,800 Mbit/s) 500 m / 10 km[g] 127/224

Fibre Channel
Fibre Channel
16Gbit 16GFC T11 / INCITS Project 2118-D / Rev 6.10 serial 14.025 Gbit/s 64b66b 1,575 MB/s[e][f] (13,600 Mbit/s) 500 m / 10 km[g] 127/224

SAS 1.1 Serial attached SCSI T10 / INCITS 417-2006 serial 3 Gbit/s 8b10b 300 MB/s[e][f] (2,400 Mbit/s) 6 m 16,256[h]

SAS 2.1 T10 / INCITS 478-2011 serial 6 Gbit/s 600 MB/s[e][f] (4,800 Mbit/s) 6 m 16,256[h]

SAS 3.0 T10 / INCITS 519 serial 12 Gbit/s 1,200 MB/s[e][f] (9,600 Mbit/s) 6 m 16,256[h]

SAS 4.0 T10 / INCITS 534 (draft) serial 22.5 Gbit/s 128b150b 2,400 MB/s[e][f] (19,200 Mbit/s) tbd 16,256[h]

IEEE 1394-2008 Firewire S3200, i.Link, Serial Bus Protocol (SBP) IEEE Std. 1394-2008 serial 3.145728 Gbit/s 8b10b 315 MB/s (2,517 Mbit/s) 4.5 m 63

SCSI
SCSI
Express SCSI
SCSI
over PCIe
PCIe
(SOP) T10 / INCITS 489 serial 8 GT/s (PCIe 3.0) 128b130b 985 MB/s[e][f][i] (7,877 Mbit/s) short, backplane only 258

USB Attached SCSI 2 UAS-2 T10 / INCITS 520 serial 10 Gbit/s (USB 3.1) 128b132b ~1,200 MB/s[e][f] (~9,500 Mbit/s) 3 m[j] 127

ATAPI over Parallel ATA ATA Packet Interface T13 / NCITS 317-1998 16 33 MHz DDR none 133 MB/s[k] (1,064 Mbit/s) 457 mm (18 inches) 2

ATAPI over Serial ATA serial 6 Gbit/s 8b10b 600 MB/s[l] (4,800 Mbit/s) 1 m 1 (15 with port multiplier)

iSCSI Internet Small Computer System Interface, SCSI
SCSI
over IP IETF / RFC 7143 mostly serial implementation- and network-dependent 1,187 MB/s[m] or 1,239 MB/s[n] implementation- and network-dependent 2128 (IPv6)

SRP SCSI RDMA Protocol ( SCSI
SCSI
over InfiniBand
InfiniBand
and similar) T10 / INCITS 365-2002 implementation- and network-dependent

Cabling[edit]

Bus terminator with top cover removed

SCSI
SCSI
Parallel Interface[edit] Internal parallel SCSI
SCSI
cables are usually ribbons, with two or more 50–, 68–, or 80–pin connectors attached. External cables are typically shielded (but may not be), with 50– or 68–pin connectors at each end, depending upon the specific SCSI
SCSI
bus width supported. The 80–pin Single Connector Attachment
Single Connector Attachment
(SCA) is typically used for hot-pluggable devices Fibre Channel[edit] Fibre Channel
Fibre Channel
can be used to transport SCSI
SCSI
information units, as defined by the Fibre Channel Protocol for SCSI
SCSI
(FCP). These connections are hot-pluggable and are usually implemented with optical fiber. Serial attached SCSI[edit] Serial attached SCSI
Serial attached SCSI
(SAS) uses a modified Serial ATA
Serial ATA
data and power cable. iSCSI[edit] i SCSI
SCSI
(Internet Small Computer System Interface) usually uses Ethernet connectors and cables as its physical transport, but can run over any physical transport capable of transporting IP. SRP[edit] The SCSI RDMA Protocol (SRP) is a protocol that specifies how to transport SCSI
SCSI
commands over a reliable RDMA connection. This protocol can run over any RDMA-capable physical transport, e.g. InfiniBand
InfiniBand
or Ethernet
Ethernet
when using RoCE or iWARP. USB Attached SCSI[edit] USB Attached SCSI allows SCSI
SCSI
devices to use the Universal Serial Bus. Automation/Drive Interface[edit] The Automation/Drive Interface − Transport Protocol (ADT) is used to connect removable media devices, such as tape drives, with the controllers of the libraries (automation devices) in which they are installed. The ADI standard specifies the use of RS-422
RS-422
for the physical connections. The second-generation ADT-2 standard defines iADT, use of the ADT protocol over IP (Internet Protocol) connections, such as over Ethernet. The Automation/Drive Interface − Commands standards (ADC, ADC-2, and ADC-3) define SCSI
SCSI
commands for these installations. SCSI command protocol[edit] Main article: SCSI
SCSI
command In addition to many different hardware implementations, the SCSI standards also include an extensive set of command definitions. The SCSI command architecture was originally defined for parallel SCSI buses but has been carried forward with minimal change for use with i SCSI
SCSI
and serial SCSI. Other technologies which use the SCSI
SCSI
command set include the ATA Packet Interface, USB Mass Storage class and FireWire SBP-2. In SCSI
SCSI
terminology, communication takes place between an initiator and a target. The initiator sends a command to the target, which then responds. SCSI
SCSI
commands are sent in a Command Descriptor Block (CDB). The CDB consists of a one byte operation code followed by five or more bytes containing command-specific parameters. At the end of the command sequence, the target returns a status code byte, such as 00h for success, 02h for an error (called a Check Condition), or 08h for busy. When the target returns a Check Condition in response to a command, the initiator usually then issues a SCSI Request Sense command in order to obtain a key code qualifier (KCQ) from the target. The Check Condition and Request Sense sequence involves a special SCSI
SCSI
protocol called a Contingent Allegiance Condition. There are four categories of SCSI
SCSI
commands: N (non-data), W (writing data from initiator to target), R (reading data), and B (bidirectional). There are about 60 different SCSI
SCSI
commands in total, with the most commonly used being:

Test unit ready: Queries device to see if it is ready for data transfers (disk spun up, media loaded, etc.). Inquiry: Returns basic device information. Request sense: Returns any error codes from the previous command that returned an error status. Send diagnostic and Receive diagnostic results: runs a simple self-test, or a specialised test defined in a diagnostic page. Start/Stop unit: Spins disks up and down, or loads/unloads media (CD, tape, etc.). Read capacity: Returns storage capacity. Format unit: Prepares a storage medium for use. In a disk, a low level format will occur. Some tape drives will erase the tape in response to this command. Read: (four variants): Reads data from a device. Write: (four variants): Writes data to a device. Log sense: Returns current information from log pages. Mode sense: Returns current device parameters from mode pages. Mode select: Sets device parameters in a mode page.

Each device on the SCSI
SCSI
bus is assigned a unique SCSI
SCSI
identification number or ID. Devices may encompass multiple logical units, which are addressed by logical unit number (LUN). Simple devices have just one LUN, more complex devices may have multiple LUNs. A "direct access" (i.e. disk type) storage device consists of a number of logical blocks, addressed by Logical Block Address (LBA). A typical LBA equates to 512 bytes of storage. The usage of LBAs has evolved over time and so four different command variants are provided for reading and writing data. The Read(6) and Write(6) commands contain a 21-bit LBA address. The Read(10), Read(12), Read Long, Write(10), Write(12), and Write Long commands all contain a 32-bit LBA address plus various other parameter options. The capacity of a "sequential access" (i.e. tape-type) device is not specified because it depends, amongst other things, on the length of the tape, which is not identified in a machine-readable way. Read and write operations on a sequential access device begin at the current tape position, not at a specific LBA. The block size on sequential access devices can either be fixed or variable, depending on the specific device. Tape devices such as half-inch 9-track tape, DDS (4 mm tapes physically similar to DAT), Exabyte, etc., support variable block sizes. Device identification[edit] Parallel interface[edit]

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On a parallel SCSI
SCSI
bus, a device (e.g. host adapter, disk drive) is identified by a " SCSI
SCSI
ID", which is a number in the range 0–7 on a narrow bus and in the range 0–15 on a wide bus. On earlier models a physical jumper or switch controls the SCSI
SCSI
ID of the initiator (host adapter). On modern host adapters (since about 1997), doing I/O to the adapter sets the SCSI
SCSI
ID; for example, the adapter often contains a BIOS program that runs when the computer boots up and that program has menus that let the operator choose the SCSI
SCSI
ID of the host adapter. Alternatively, the host adapter may come with software that must be installed on the host computer to configure the SCSI
SCSI
ID. The traditional SCSI
SCSI
ID for a host adapter is 7, as that ID has the highest priority during bus arbitration (even on a 16 bit bus). The SCSI
SCSI
ID of a device in a drive enclosure that has a back plane is set either by jumpers or by the slot in the enclosure the device is installed into, depending on the model of the enclosure. In the latter case, each slot on the enclosure's back plane delivers control signals to the drive to select a unique SCSI
SCSI
ID. A SCSI
SCSI
enclosure without a back plane often has a switch for each drive to choose the drive's SCSI
SCSI
ID. The enclosure is packaged with connectors that must be plugged into the drive where the jumpers are typically located; the switch emulates the necessary jumpers. While there is no standard that makes this work, drive designers typically set up their jumper headers in a consistent format that matches the way that these switches implement. Setting the bootable (or first) hard disk to SCSI
SCSI
ID 0 is an accepted IT community recommendation. SCSI
SCSI
ID 2 is usually set aside for the floppy disk drive while SCSI
SCSI
ID 3 is typically for a CD-ROM
CD-ROM
drive.[12] General[edit] Note that a SCSI target device (which can be called a "physical unit") is often divided into smaller "logical units". For example, a high-end disk subsystem may be a single SCSI
SCSI
device but contain dozens of individual disk drives, each of which is a logical unit. Further, a RAID
RAID
array may be a single SCSI
SCSI
device, but may contain many logical units, each of which is a "virtual" disk—a stripe set or mirror set constructed from portions of real disk drives. The SCSI
SCSI
ID, WWN, etc. in this case identifies the whole subsystem, and a second number, the logical unit number (LUN) identifies a disk device (real or virtual) within the subsystem. It is quite common, though incorrect, to refer to the logical unit itself as a "LUN".[13] Accordingly, the actual LUN may be called a "LUN number" or "LUN id".[14] In modern SCSI
SCSI
transport protocols, there is an automated process for the "discovery" of the IDs. The SSA initiator (normally the host computer through the 'host adaptor') "walk the loop" to determine what devices are connected and then assigns each one a 7-bit "hop-count" value. Fibre Channel
Fibre Channel
– Arbitrated Loop (FC-AL) initiators use the LIP (Loop Initialization Protocol) to interrogate each device port for its WWN (World Wide Name). For iSCSI, because of the unlimited scope of the (IP) network, the process is quite complicated. These discovery processes occur at power-on/initialization time and also if the bus topology changes later, for example if an extra device is added. Device Type[edit] Main article: SCSI
SCSI
Peripheral
Peripheral
Device Type While all SCSI
SCSI
controllers can work with read/write storage devices, i.e. disk and tape, some will not work with some other device types; older controllers are likely to be more limited,[15] sometimes by their driver software, and more Device Types were added as SCSI evolved. Even CD-ROMs are not handled by all controllers. Device Type is a 5-bit field reported by a SCSI
SCSI
Inquiry Command; defined SCSI Peripheral
Peripheral
Device Types include, in addition to many varieties of storage device, printer, scanner, communications device, and a catch-all "processor" type for devices not otherwise listed. SCSI
SCSI
enclosure services[edit] In larger SCSI
SCSI
servers, the disk-drive devices are housed in an intelligent enclosure that supports SCSI Enclosure Services (SES). The initiator can communicate with the enclosure using a specialized set of SCSI
SCSI
commands to access power, cooling, and other non-data characteristics. See also[edit]

Fibre Channel List of device bandwidths Parallel SCSI Serial Attached SCSI

Notes[edit]

^ Clock rate in MHz for parallel, or bitrate (per second) for serial interfaces. ^ For daisy-chain designs, length of bus, from end to end; for point-to-point, length of a single link ^ Including any host adapters (i.e., computers count as a device) ^ a b spatial reuse ^ a b c d e f g h i j k l m full duplex ^ a b c d e f g h i j k l m per direction ^ a b c d e 500 meters for multi-mode, 10 kilometers for single-mode ^ a b c d 128 per expander ^ per PCIe 3.0 lane ^ not specified, practical limitation of USB 3.1 ^ half duplex ^ half duplex ^ over Ethernet, per 10 Gbit/s, MTU 1500 ^ over Ethernet, per 10 Gbit/s, MTU 9000

References[edit]

^ Field. The Book of SCSI. p. 1.  ^ "ANSI INCITS 131 94th Edition, 2004". global.ihs.com. Retrieved 2017-04-25.  ^ ANSI Draft SASI Standard, Rev D, February 17, 1982, pg. ii states, "9/15/81 first presentation to ANSI committee X3T9-3 (2 weeks following announcement in Electronic Design)." ^ a b ""How Computer Storage Became a Modern Business", Computer History Museum, March 9, 2005". Youtube.com. Retrieved 2014-05-11.  ^ ANSI SCSI
SCSI
Standard, X3.131-1986, June 23, 1986, 2nd, foreword. ^ a b Working document for ANSI meeting on March 3, 1982, "SASI SHUGART ASSOCIATES SYSTEM INTERFACE, Revision D, February 17, 1982" ^ "ENDL Inc. Home Page". Endl.com. 2014-04-27. Retrieved 2014-05-11.  ^ "NCR Collection (LSI Logic)at Smithsonian Museum". Smithsonianchips.si.edu. Retrieved 2014-05-11.  ^ "Power Macintosh
Macintosh
G3, G4: Differences Between Available SCSI
SCSI
Cards". Apple, Inc. 2010-04-01. Retrieved 2014-07-07.  ^ David Allen (2005-07-01). "The benefits of Serial Attached SCSI (SAS)". Retrieved 2015-02-06.  ^ Shuangbao Paul Wang. Computer Architecture and Security: Fundamentals of Designing Secure Computer Systems (1st ed.). ISBN 978-1118168813.  ^ Groth, David; Dan Newland (January 2001). A+ Complete Study Guide (2nd Edition). Alameda, CA, USA: l Sybex. p. 183. ISBN 0-7821-4244-3.  ^ "na_lun(1) – Manual page for "lun" on NetApp
NetApp
DataONTAP". NetApp. July 7, 2009. The lun command is used to create and manage luns[...]  Missing or empty url= (help); access-date= requires url= (help) ^ "na_lun(1) – Manual page for "lun" on NetApp
NetApp
DataONTAP". NetApp. July 7, 2009. If a LUN ID is not specified, the smallest number [...] is automatically picked.  Missing or empty url= (help); access-date= requires url= (help) ^ "An example of an old SCSI
SCSI
interface which supported only named mass storage devices". H30097.www3.hp.com. Retrieved 2014-05-11. 

Bibliography[edit]

Pickett, Joseph P.; et al., eds. (2000). The American Heritage Dictionary of the English Language (AHD) (Fourth ed.). Houghton Mifflin Company. ISBN 0-395-82517-2.  Field, Gary; Peter Ridge; John Lohmeyer; Gerhard Islinger; Stefan Groll (2000). The Book of SCSI
SCSI
(2nd ed.). No Starch Press. ISBN 1-886411-10-7. 

External links[edit]

Wikimedia Commons has media related to SCSI.

Look up SCSI
SCSI
in Wiktionary, the free dictionary.

InterNational Committee for Information Technology Standards: T10 Technical Committee on SCSI
SCSI
Storage Interfaces ( SCSI
SCSI
standards committee) Terminology:

SCSI
SCSI
Trade Association: Terms and Terminology SCSI
SCSI
terms explained by Adaptec

Cabling and connectors:

Pacific Custom Cable: SCSI
SCSI
Tutorial Delec: Hardware Guide: SCSI
SCSI
Guide (archive at Internet Archive) DataPro: All About SCSI PINOUTS.RU: HDD connectors pinouts (has links to PINOUTS.RU pages about SCSI
SCSI
hard drives) SCSI4ME: Internal SCSI
SCSI
Connectors / External SCSI
SCSI
Connectors (visual aids for SCSI
SCSI
connectors) IBM: SCSI connector
SCSI connector
photos, specifications, and options - Servers and IntelliStation

Linux:

IBM developerWorks: Anatomy of the Linux
Linux
SCSI
SCSI
subsystem IBM developerWorks: Tour the Linux
Linux
generic SCSI
SCSI
driver

David Woodsmall: Complete SCSI
SCSI
/ i SCSI
SCSI
/ RAID
RAID
/ SAS Reference WWW Virtual Library for SCSI, The Small Computer Systems Interface Gary Field: SCSI
SCSI
Info Central (home of the official FAQ for the comp.periphs.scsi Usenet newsgroup) SCSI
SCSI
Standards and Technology Update (PDF)

Authority control

.