181:
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of the device, usually because it does not fit a standard USB class or has additional functionality. An embedded USB mass-storage device makes it possible to install additional drivers without CD-ROM disks, floppies or
Internet access to a vendor website; this is important, since many modern systems are supplied without optical or floppy drives. Internet access may be unavailable because the device provides network access (wireless,
505:
133:
318:. A Windows Mobile device cannot display its file system as a mass-storage device unless the device implementer adds that functionality. However, third-party applications add MSC emulation to most WM devices (commercial Softick CardExport and free WM5torage). Only memory cards (not internal-storage memory) can generally be exported, due to file-systems issues; see
681:
or
Ethernet cards). The embedded USB mass storage is usually made permanently read-only by the vendor, preventing accidental corruption and use for other purposes (although it may be updated with proprietary protocols when performing a firmware upgrade). Advantages of this method of distribution are
676:
Devices connected by a single USB port may function as multiple USB devices, one of which is a USB mass-storage device. This simplifies distribution and access to drivers and documentation, primarily for the
Microsoft Windows and Mac OS X operating systems. Such drivers are required to make full use
456:
support most mass-storage devices for the data transfer of media such as pictures and music. As of April 2010, the Xbox 360 (a) used a mass-storage device for saved games and the PS3 allowed transfers between devices on a mass-storage device. Independent developers have released drivers for the
722:
that supports a USB mass-storage interface. Some USB mass-storage interfaces are generic, providing basic read-write commands; although that works well for basic data transfers with devices containing hard drives, there is no simple way to send advanced, device-specific commands to such USB
672:
for performance and durability. Some devices with embedded storage resembling a USB mass-storage device (such as MP3 players with a USB port) will report a damaged (or missing) file system if they are reformatted with a different file system. However, most default-partition devices may be
539:
The USB mass-storage specification provides an interface to a number of industry-standard command sets, allowing a device to disclose its subclass. In practice, there is little support for specifying a command set via its subclass; most drivers only support the
392:
to kernel 2.2.18 has been made. In Linux, more features exist in addition to the generic drivers for USB mass-storage device class devices, including quirks, bug fixes and additional functionality for devices and controllers (vendor-enabled functions such as
742:(SAT) as a generic protocol for interacting with ATA (and SATA) devices. Using esoteric ATA or SCSI pass-through commands (such as secure-erase or password protection) when a drive is connected via a USB bridge may cause drive failure, especially with the
171:
device accessible to a host computing device and enables file transfers between the host and the USB device. To a host, the USB device acts as an external hard drive; the protocol set interfaces with a number of storage devices.
673:
repartitioned (by reducing the first partition and file system) with additional partitions. Such devices will use the first partition for their own operations; after connecting to the host system, all partitions are available.
662:
Two main partitioning schemes are used by vendors of pre-formatted devices. One puts the file system (usually FAT32) directly on the device without partitioning, making it start from sector 0 without additional boot sectors,
288:), and a device-specific driver was needed for each type of USB storage device. Third-party, freeware drivers became available for Windows 98 and Windows 98SE, and third-party drivers are also available for Windows NT 4.0.
667:
or partitions. The other uses a DOS partition table (and MBR code), with one partition spanning the entire device. This partition is often aligned to a high power of two of the sectors (such as 1 or 2 MB), common in
650:
In cameras, MP3 players and similar devices which must access a file system independent of an external host, the FAT32 file system is preferred by manufacturers. All such devices halt their file-system
655:) before making it available to a host operating system to prevent file-system corruption or other damage (although it is theoretically possible for both devices to use read-only mode or a
588:
on conforming devices. Based on the specified command set and any subset, it provides a means to read and write sectors of data (similar to the low-level interface used to access a
252:
Devices supporting this standard are known as MSC (Mass
Storage Class) devices. While MSC is the original abbreviation, UMS (Universal Mass Storage) has also come into common use.
349:
nor most compatible operating systems included support for USB. Third-party generic drivers, such as Duse, USBASPI and DOSUSB, are available to support USB mass-storage devices.
706:(which allows all data on the drive to be securely erased) and S.M.A.R.T. (accessing indicators of drive reliability) exist as extensions to low-level drive command sets such as
440:
has supported USB mass-storage devices since its 5.3 T9 and 6.1 T3 versions; however, it is not well-supported and lacks features such as partitioning and general blocking.
592:). Operating systems may treat a USB mass-storage device like a hard drive; users may partition it in any format (such as MBR and GPT), and format it with any file system.
284:
OSR2.1, an update to the operating system, featured limited support for USB. During that time no generic USB mass-storage driver was produced by
Microsoft (including for
727:(UAS) protocol, introduced in USB 3.0, fixes several of these issues, including command queuing, command pipes for hardware requiring them, and power management.
571:
730:
Specific USB 2.0 chipsets had proprietary methods of achieving SCSI pass-through, which could be used to read S.M.A.R.T. data from drives using tools such as
643:
or BSD). This choice may limit (or prevent) access to a device's contents by equipment using a different operating system. OS-dependent storage options include
398:
790:
53:
811:
401:
or temperature monitoring, controlling the spin-up and spin-down of hard disk drives, and other options). This includes a certain portion of
100:
72:
2036:
Interfaces are listed by their speed in the (roughly) ascending order, so the interface at the end of each section should be the fastest.
1481:
858:
2009:
79:
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17:
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mass-storage devices (though, devices may create their own communication protocols over a standard USB control interface). The
86:
1015:
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Microsoft
Windows has supported MSC since Windows 2000. There is no support for USB supplied by Microsoft in Windows before
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68:
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519:
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883:
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about Bulk-Only
Transport: we keep linking to this article to contrast with UAS but there's no description here!.
988:
1461:
57:
905:"#25 (SCSI pass through for SMART via USB on MacOSX smartmontools? 3rd party code available!) – smartmontools"
2013:
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include support for USB mass storage devices; support on older systems is usually available through patches.
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1611:
93:
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on devices with USB Host. However, portable devices typically cannot provide enough power for hard-drive
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1301:
659:). Some devices have a write-protection switch (or option) allowing them to be used in read-only mode.
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417:
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241:
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feature of
Windows worked on all removable media, allowing USB storage devices to become a portal for
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support USB mass storage; Mac OS 8.5.1 supported USB mass storage through an optional driver.
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303:
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615:). However, USB mass storage devices may be formatted with any other file system, such as
8:
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Please expand the section to include this information. Further details may exist on the
180:
1317:
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859:"Xbox Live's Major Nelson » USB Memory Support for the Xbox 360 coming April 6th"
337:, Microsoft limited AutoRun to CD and DVD drives, updating previous Windows versions.
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436:), has supported USB and USB mass-storage devices since its version 4.0E (1998).
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option followed by "chipset"). More recent USB storage chipsets support the
310:(a 2.5-inch (64 mm) hard drive typically requires the maximum 2.5
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has supported USB mass-storage devices since its 2.4 series (2001), and a
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has support (via a generic driver) for standard USB mass-storage devices;
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lower cost, simplified installation and ensuring driver portability.
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Because of its relative simplicity, the most common file system on
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supports accessing most USB mass-storage devices formatted with
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718:. These features may not work when the drives are placed in a
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SCSI transparent command set (use "inquiry" to obtain the PDT)
544:, designating their subset of the SCSI command set with their
465:
to access USB mass-storage devices. In these calculators, the
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command pass-through for ATA-USB bridges, which is useful for
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An action camera being accessed via mass storage device class
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since its version 2.7 (2000). Digital UNIX (later known as
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548:(PDT). Subclass codes specify the following command sets:
188:
Devices connected to computers via this standard include:
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1052:
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791:"Changes in Windows to Meet Changes in Threat Landscape"
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1021:
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typically implement the USB mass storage device class.
139:
typically implement the USB mass storage device class.
443:
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and all later
Windows versions also include support.
1016:
What actually happens when you plug in a USB device?
830:"eserver: HOWTO: JFS2 on USB device on AIX 5.3.11.1"
420:
has supported devices since its version 2.8 (1998),
603:, cameras, or digital audio players is Microsoft's
60:. Unsourced material may be challenged and removed.
314:in the USB specification) without a self-powered
2055:
584:The specification does not require a particular
1639:Coherent Accelerator Processor Interface (CAPI)
812:"Driver for USB Mass Storage compliant devices"
1011:USB Mass Storage Device source code in FreeBSD
1302:
1037:
989:Mass Storage Class Specification Overview 1.4
412:
647:, partition tables and software encryption.
360:
255:
1309:
1295:
1044:
1030:
994:Mass Storage Bootability Specification 1.0
562:-2 (used by ATAPI-style CD and DVD drives)
1018: – Linux kernel internals
984:From the USB Implementers Forum website:
884:"83Plus:Software:usb8x/Asm Interface/MSD"
120:Learn how and when to remove this message
480:
179:
131:
611:file system (with optional support for
409:, since Android uses the Linux kernel.
14:
2056:
577:SFF-8070i (used by ARMD-style devices)
1290:
1025:
498:
267:
58:adding citations to reliable sources
29:
405:-based devices, through support of
355:Advanced SCSI Programming Interface
198:External optical drives, including
24:
979:
702:(which may increase performance),
444:Game consoles and embedded devices
319:
25:
2085:
1004:
428:since its version 4.0 (2000) and
2040:
2039:
503:
476:
353:supports USB mass storage as an
219:Adapters between standard flash
34:
69:"USB mass storage device class"
45:needs additional citations for
950:
921:
897:
876:
851:
822:
804:
783:
424:since its version 1.5 (2000),
13:
1:
1634:Intel Ultra Path Interconnect
999:"Mass Storage Bulk Only 1.0"
958:"ATA Secure Erase - ata Wiki"
776:
145:USB mass storage device class
1612:Intel QuickPath Interconnect
1602:Direct Media Interface (DMI)
836:. 2010-01-21. Archived from
552:Reduced Block Commands (RBC)
542:SCSI transparent command set
473:user-interface application.
7:
793:. TechNet Blogs. 2009-04-28
749:
546:SCSI Peripheral Device Type
27:USB device class for drives
10:
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1597:Compute Express Link (CXL)
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413:Other Unix-related systems
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1992:
1971:
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1834:IEEE-1284 (parallel port)
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1749:logical device interface)
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1059:
766:Picture Transfer Protocol
685:
463:TI-84 Plus Silver Edition
340:
2069:Computer storage devices
1225:USB flash drive security
756:Disk encryption software
572:Uniform Floppy Interface
379:
361:Classic Mac OS and macOS
256:Operating system support
206:reader and writer drives
157:communications protocols
155:) is a set of computing
1051:
834:Eserver.livejournal.com
761:Media Transfer Protocol
175:
18:USB mass storage device
2064:Computer storage buses
1396:List of bus bandwidths
1065:USB Implementers Forum
771:SCSI / ATA Translation
740:SCSI / ATA Translation
700:Native Command Queuing
696:Tagged Command Queuing
514:is missing information
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232:Portable media players
185:
165:USB Implementers Forum
140:
484:
183:
135:
1839:IEEE-1394 (FireWire)
1577:PCI Extended (PCI-X)
886:. WikiTI. 2009-02-18
469:driver supports the
54:improve this article
1680:Parallel ATA (PATA)
962:Ata.wiki.kernel.org
929:"USB smartmontools"
657:cluster file system
223:and USB connections
1587:PCI Express (PCIe)
694:commands, such as
670:solid state drives
568:-157 (tape drives)
491:
357:(ASPI) interface.
215:Solid-state drives
192:External magnetic
186:
141:
2051:
2050:
2037:
1764:Apple Desktop Bus
1741:PCI Express (via
1700:Serial ATA (SATA)
1386:Network on a chip
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1283:
1251:Ethernet over USB
1246:Enhanced mini-USB
725:USB Attached SCSI
537:
536:
495:USB Attached SCSI
333:. Beginning with
268:Microsoft Windows
262:operating systems
163:, defined by the
159:, specifically a
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16:(Redirected from
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1497:HP Precision Bus
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935:. Archived from
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814:. Archived from
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704:ATA Secure Erase
637:Unix File System
601:USB flash drives
597:embedded devices
532:
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331:computer viruses
260:Most mainstream
210:USB flash drives
161:USB Device Class
137:USB flash drives
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1967:
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1627:Infinity Fabric
1457:Europe Card Bus
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1234:
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1189:Human interface
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308:disk enclosures
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147:(also known as
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818:on 2005-09-23.
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690:Some advanced
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1779:Commodore bus
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1759:
1755:
1748:
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1727:Fibre Channel
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1391:Plug and play
1389:
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1381:Bus mastering
1379:
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1367:
1364:
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1359:
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1356:Back-side bus
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1228:
1226:
1223:
1221:
1218:
1216:
1215:Juice jacking
1213:
1212:
1210:
1206:
1200:
1197:
1195:
1192:
1190:
1187:
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1180:
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1168:
1166:
1163:
1162:
1161:
1158:
1157:
1155:
1153:
1149:
1143:
1142:USB On-The-Go
1140:
1138:
1135:
1133:
1130:
1128:
1125:
1123:
1120:
1118:
1115:
1113:
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986:
985:
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959:
953:
939:on 2012-02-07
938:
934:
930:
924:
910:
906:
900:
885:
879:
864:
860:
854:
840:on 2012-03-31
839:
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549:
547:
543:
531:
521:
515:
512:This section
510:
506:
501:
500:
496:
488:
483:
477:Device access
474:
472:
468:
464:
460:
455:
454:PlayStation 3
451:
441:
439:
435:
431:
427:
423:
419:
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387:
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371:
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358:
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348:
338:
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328:
323:
321:
320:device access
317:
313:
309:
305:
301:
297:
295:
291:
287:
283:
279:
275:
265:
263:
253:
248:
247:Mobile phones
245:
243:
240:
238:
235:
233:
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228:
225:
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218:
216:
213:
211:
208:
205:
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197:
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182:
173:
170:
167:that makes a
166:
162:
158:
154:
150:
146:
138:
134:
124:
121:
113:
110:November 2022
102:
99:
95:
92:
88:
85:
81:
78:
74:
71: –
70:
66:
65:Find sources:
59:
55:
49:
48:
43:This article
41:
37:
32:
31:
19:
1532:TURBOchannel
1322:
1160:Mass storage
1159:
983:
966:. Retrieved
964:. 2013-07-22
961:
952:
941:. Retrieved
937:the original
932:
923:
912:. Retrieved
908:
899:
888:. Retrieved
878:
867:. Retrieved
865:. 2010-03-26
862:
853:
842:. Retrieved
838:the original
833:
824:
816:the original
806:
795:. Retrieved
785:
729:
689:
675:
661:
649:
594:
583:
538:
525:
513:
487:card readers
447:
416:
386:Linux kernel
383:
364:
344:
324:
298:
290:Windows 2000
271:
259:
251:
237:Card readers
221:memory cards
187:
152:
148:
144:
142:
116:
107:
97:
90:
83:
76:
64:
52:Please help
47:verification
44:
2005:CoreConnect
1984:ExpressCard
1912:Thunderbolt
1902:Camera Link
1685:Bus and Tag
1371:Address bus
1366:Control bus
1361:Daisy chain
1165:Flash drive
734:(using the
586:file system
194:hard drives
2058:Categories
1858:ACCESS.bus
1757:Peripheral
1557:InfiniBand
1552:HP GSC bus
1346:System bus
1271:PoweredUSB
1256:Decoration
1230:USB killer
1079:connectors
968:2014-01-21
943:2014-01-21
914:2014-01-21
890:2012-11-07
869:2012-11-07
844:2012-11-07
797:2012-11-07
777:References
590:hard drive
493:See also:
459:TI-84 Plus
434:Tru64 UNIX
399:S.M.A.R.T.
294:Windows Me
286:Windows 98
282:Windows 95
274:Windows 95
80:newspapers
1819:Lightning
1769:Atari SIO
1644:SpaceWire
1477:Zorro III
1417:S-100 bus
1412:SS-50 bus
1405:Standards
1325:standards
1318:Technical
1170:FlashCard
746:utility.
520:talk page
322:, below.
2045:Category
2020:Wishbone
1993:Embedded
1972:Portable
1892:Profibus
1824:DMX512-A
1710:Parallel
1562:Ethernet
1472:Zorro II
1422:Multibus
1323:de facto
1208:Security
1105:Versions
1072:Hardware
750:See also
732:smartctl
653:dismount
621:HFS Plus
599:such as
558:-8020i,
528:May 2023
450:Xbox 360
390:backport
370:Mac OS 9
345:Neither
2025:SLIMbus
1979:PC Card
1963:TOSLINK
1653:Storage
1607:RapidIO
1487:FASTBUS
1442:STD Bus
1339:General
1086:cabling
665:headers
641:Solaris
430:OpenBSD
426:FreeBSD
418:Solaris
407:USB-OTG
403:Android
351:FreeDOS
327:AutoRun
316:USB hub
149:USB MSC
94:scholar
1958:S/PDIF
1849:1-Wire
1814:RS-485
1809:RS-423
1804:RS-422
1799:RS-232
1660:ST-506
1617:NVLink
1467:STEbus
1427:Unibus
1276:WebUSB
1220:BadUSB
744:hdparm
686:Design
422:NetBSD
347:MS-DOS
341:MS-DOS
96:
89:
82:
75:
67:
1953:McASP
1921:Audio
1866:SMBus
1862:PMBus
1844:UNI/O
1784:HP-IL
1737:SATAe
1722:ESCON
1695:HIPPI
1527:NuBus
1482:CAMAC
1452:Q-Bus
1447:SMBus
1432:VAXBI
1329:wired
1239:Other
1194:Video
1132:USB-C
1093:power
716:ATAPI
635:, or
633:Linux
625:macOS
609:FAT32
574:(UFI)
471:msd8x
467:usb8x
380:Linux
374:macOS
101:JSTOR
87:books
2010:AMBA
1948:MADI
1933:AES3
1794:MIDI
1747:NVMe
1743:AHCI
1705:SCSI
1690:DSSI
1665:ESDI
1542:SBus
1502:EISA
1437:MBus
1327:for
1320:and
1177:UASP
1137:USB4
714:and
708:SCSI
698:and
629:Ext2
617:NTFS
485:USB
461:and
452:and
448:The
384:The
372:and
325:The
276:and
242:PDAs
202:and
176:Uses
143:The
73:news
2074:USB
2014:AXI
1943:I²S
1897:USB
1882:D²B
1877:SPI
1872:I3C
1854:I²C
1789:HIL
1774:DCB
1745:or
1732:SSA
1715:SAS
1675:SMD
1670:IPI
1592:AGP
1582:PXI
1572:PCI
1567:UPA
1547:VLB
1537:MCA
1522:VPX
1517:VXS
1512:VXI
1507:VME
1492:LPC
1462:ISA
1261:Hub
1182:SSD
1127:3.0
1122:2.0
1117:1.1
1112:1.0
1053:USB
712:ATA
679:GSM
645:LVM
639:on
631:on
623:on
607:or
605:FAT
566:QIC
560:MMC
556:SFF
438:AIX
395:ATA
368:'s
304:FAT
204:DVD
169:USB
153:UMS
151:or
56:by
2060::
1864:,
1860:,
960:.
931:.
907:.
861:.
832:.
736:-d
710:,
627:,
280:.
200:CD
2016:)
2012:(
1868:)
1856:(
1310:e
1303:t
1296:v
1045:e
1038:t
1031:v
971:.
946:.
917:.
893:.
872:.
847:.
800:.
651:(
530:)
526:(
522:.
312:W
123:)
117:(
112:)
108:(
98:·
91:·
84:·
77:·
50:.
20:)
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