439:"super-block" was written with a unique signature which could be located in memory upon reboot. The super-block, and all other RRD disk "blocks" maintained check sums to enable the invalidation of the disk if corruption was detected. At first, the ASDG RRD was locked to ASDG memory boards and used as a selling feature. Later, the ASDG RRD was made available as shareware carrying a suggested donation of 10 dollars. The shareware version appeared on
42:
244:, which means it will be lost in the event of power loss, whether intentional (computer reboot or shutdown) or accidental (power failure or system crash). This is, in general, a weakness (the data must periodically be backed up to a persistent-storage medium to avoid loss), but is sometimes desirable: for example, when working with a decrypted copy of an
306:. The idea was to enable the early microcomputers to use more RAM than the CPU could directly address. Making bank-switched RAM behave like a disk drive was much faster than the disk drives. especially before hard drives were readily available on such machines. The Silicon Disk was launched in 1980, initially for the
466:. RAM drives are particularly useful in high-performance, low-resource applications for which Unix-like operating systems are sometimes configured. There are also a few specialized "ultra-lightweight" Linux distributions which are designed to boot from removable media and stored in a ramdisk for the entire session.
554:
card interface located in the front panel, allowing non-volatile data being stored on the RAM drive to be copied on the
CompactFlash card in case of power failure and low backup battery. Two pushbuttons located on the front panel allows the user to manually backup / restore data on the RAM drive. The
438:
was the ability of the RAM drive to survive most crashes and reboots. Called the ASDG Recoverable Ram Disk, the device survived reboots by allocating memory dynamically in the reverse order of default memory allocation (a feature supported by the underlying OS) so as to reduce memory fragmentation. A
107:
devices were conceived to bridge the performance gap between internal memory and secondary storage devices. In the advent of solid-state devices this advantage lost most of its appeal. However, solid-state devices do suffer from wear from frequent writing. Primary memory writes do not so or in far
540:
produced the ANS-9010 Serial ATA RAM disk, max 64 GB. Quote from the tech report: The ANS-9010 "which has eight DDR2 DIMM slots and support for up to 8 GB of memory per slot. The ANS-9010 also features a pair of Serial ATA ports, allowing it to function as a single drive or masquerade as a pair of
571:. If there is a power loss the data can be saved to an internal 4GB ssd in 60 seconds, via the use of a battery backup. Thereafter the data can be recovered back in to RAM once power is restored. A host power loss triggers the DDRdrive X1 to back up volatile data to on-board non-volatile storage.
521:
Both devices used the SATA 1.0 interface to transfer data from the dedicated RAM drive to the system. The SATA interface was a slow bottleneck that limited the maximum performance of both RAM drives, but these drives still provided exceptionally low data access latency and high sustained transfer
498:
used 64 to 128 megabytes of PC100 or PC133 memory. The one gigabyte PC133 modules (the largest available at the time) cost approximately $ 1,300 (equivalent to $ 2,202 in 2023). A fully outfitted Rocket Drive with four GB of storage would have cost $ 5,600 (equivalent to $ 9,486 in 2023).
478:
An early example of a hardware RAM drive was introduced by
Assimilation Process in 1986 for the Macintosh. Called the "Excalibur", it was an external 2MB RAM drive, and retailed for between $ 599 and $ 699 US. With the RAM capacity expandable in 1MB increments, its internal battery was said to be
474:
There have been RAM drives which use DRAM memory that is exclusively dedicated to function as an extremely low latency storage device. This memory is isolated from the processor and not directly accessible in the same manner as normal system memory. Some of the first dedicated RAM drives were
266:
RAM drives use normal system memory as if it were a partition on a physical hard drive rather than accessing the data bus normally used for secondary storage. Though RAM drives can often be supported directly in the operating system via special mechanisms in the OS
555:
CompactFlash card itself is not accessible to the user by normal means as the CF card is solely intended for RAM backup and restoration. The CF card's capacity has to meet / exceed the RAM module's total capacity in order to effectively work as a reliable backup.
513:
For both of these devices, the dynamic RAM requires continuous power to retain data; when power is lost, the data fades away. For the Rocket Drive, there was a connector for an external power supply separate from the computer, and the option for an external
533:, max 8GB, which was the second generation creation for the i-RAM. It has a maximum of 8 GB capacity, twice that of the i-RAM. It used the SATA-II port, again twice that of the i-RAM. One of its best selling points is that it can be used as a boot device.
666:; Rubin, Darryl; Ryan, Ralph; Schulmeisters, Karl; Shah, Rajen; Shaw, Barry; Short, Anthony; Slivka, Ben; Smirl, Jon; Stillmaker, Betty; Stoddard, John; Tillman, Dennis; Whitten, Greg; Yount, Natalie; Zeck, Steve (1988). "Technical advisors".
562:
produced the DDRDrive X1, which claims to be the fastest solid state drive in the world. The drive is a primary 4GB DDR dedicated RAM drive for regular use, which can back up to and recall from a 4GB SLC NAND drive. The intended
262:
Apart from the risk of data loss, the major limitation of RAM drives is capacity, which is constrained by the amount of installed RAM. Multi-terabyte SSD storage has become common, but RAM is still measured in gigabytes.
237:, ext2, etc., uses extra accesses, reads and writes to the drive, which although small, can add up quickly, especially in the event of many small files vs. few larger files (temporary internet folders, web caches, etc.).
289:
to allow compressed data to be accessed on the fly, without decompressing it first. This is convenient because RAM drives are often small due to the higher price per byte than conventional hard drive storage.
77:). RAM drives provide high-performance temporary storage for demanding tasks and protect non-volatile storage devices from wearing down, since RAM is not prone to wear from writing, unlike non-volatile
642:; Borman, Reuben; Borman, Rob; Butler, John; Carroll, Chuck; Chamberlain, Mark; Chell, David; Colee, Mike; Courtney, Mike; Dryfoos, Mike; Duncan, Rachel; Eckhardt, Kurt; Evans, Eric; Farmer, Rick;
510:, max 4 GB, which functioned essentially identically to the Rocket Drive, except upgraded to use the newer DDR memory technology, though also limited to a maximum of 4 GB capacity.
734:
302:, was further developed into a commercial product and marketed by JK Systems Research which became Microcosm Research Ltd when the company was joined by Peter Cheesewright of
2232:
650:; McKinney, Bruce; Martin, Pascal; Mathers, Estelle; Matthews, Bob; Melin, David; Mergentime, Charles; Nevin, Randy; Newell, Dan; Newell, Tani; Norris, David; O'Leary, Mike;
646:; Geary, Michael; Griffin, Bob; Hogarth, Doug; Johnson, James W.; Kermaani, Kaamel; King, Adrian; Koch, Reed; Landowski, James; Larson, Chris; Lennon, Thomas; Lipkie, Dan;
1143:
710:(xix+1570 pages; 26 cm) (NB. This edition was published in 1988 after extensive rework of the withdrawn 1986 first edition by a different team of authors.
183:) must move the information to a particular position before reading or writing can occur. RAM drives can access data with only the address, eliminating this
2179:
678:; Rabinowitz, Chip; Tomlin, Jim; Wilton, Richard; Wolverton, Van; Wong, William; Woodcock, JoAnne (Completely reworked ed.). Redmond, Washington, USA:
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to retain data during a power failure. The i-RAM included a small battery directly on the expansion board, for 10-16 hours of protection.
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The first software RAM drive for microcomputers was invented and written by Jerry Karlin in the UK in 1979/80. The software, known as the
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lesser effect. So RAM devices do offer an advantage to store frequently changing data, like temporary or cached information.
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to distinguish it from a hardware RAM drive that uses separate hardware containing RAM, which is a type of battery-backed
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as it, unlike most components of early versions of PC DOS, was written by IBM. Microsoft included the similar program
2011:
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effective for between 6 and 8 hours, and, unusual for the time, it was connected via the
Macintosh floppy disk port.
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Usually no battery backup is needed due to the temporary nature of the information stored in the RAM drive, but an
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85:: RAM drive uses a volatile fast memory as if it's a nonvolatile slow memory. Virtual memory is the opposite.
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of the computer. Other forms of storage media are further limited by the speed of the storage bus, such as
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A RAM drive is created from the random-access memory card to create storage space similar to a disk drive.
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218:. Compounding this limitation is the speed of the actual mechanics of the drive motors, heads, or eyes.
30:
This article is about virtual drives emulated with software. For hardware storage devices using RAM, see
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In many cases, the data stored on the RAM drive is created from data permanently stored elsewhere, for
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Disks 58 and 241. AmigaOS itself would gain a
Recoverable Ram Disk (called "RAD") in version 1.3.
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and the DR family of multi-user operating systems also came with a RAM disk named VDISK.SYS. In
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driver. This makes the non-disk nature of RAM drives invisible to both the OS and applications.
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670:. By Duncan, Ray; Bostwick, Steve; Burgoyne, Keith; Byers, Robert A.; Hogan, Thom; Kyle, Jim;
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824:"Workbench Nostalgia: The history of the AmigaOS Graphic User Interface (GUI): Release 1.3"
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has had a built in RAM drive since the release of version 1.1 in 1985 and still has it in
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333:. On systems with 128kB or more of RAM, ProDOS automatically creates a RAM drive named
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A RAM drive innovation introduced in 1986 but made generally available in 1987 by
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drives. This performance gain is due to multiple factors, including access time,
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351:(version 3.0) in August 1984, which was the first DOS component to use
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Dynamic SSD SATA-II RAM Disk, max 64GB. It uses a single SATA-II port.
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drives that can easily be split into an even faster RAID 0 array."
379:, the RAM disk defaults to the drive letter M: (for memory drive).
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69:) that a computer's software is treating as if the memory were a
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systems provide some form of RAM drive functionality, such as
340:
259:, and is re-created on the RAM drive when the system reboots.
211:
164:
121:
654:; Olsson, Mike; Osterman, Larry; Ostling, Ridge; Pai, Sunil;
1172:
544:
In 2009, Acard
Technology produced the ACARD ANS-9010BA 5.25
1868:
1472:
271:, it is generally simpler to access a RAM drive through a
282:
can keep the system running during a short power outage.
151:
File access time is greatly reduced since a RAM drive is
367:
in MS-DOS 3.2 (released in 1986), which could also use
194:
of a RAM drive is limited by the speed of the RAM, the
1168:
An extensive test report of several
Windows RAM Disks
285:
Some RAM drives use a compressed file system such as
953:"What's New: Excalibur Adds Speed and Memory to Mac"
120:
faster than other forms of digital storage, such as
2160:
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1989:
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427:utilities to create, format and mount a RAM drive.
248:file, or using the RAM drive to store the system's
403:in 1991, and kept the feature through the life of
668:The MS-DOS Encyclopedia: versions 1.0 through 3.2
735:"Overhead And Implementation Notes of ASDG RRD"
34:. For filesystems without drive emulation, see
1884:
1488:
1188:
8:
1106:"DDRdrive X1: Solid-State Storage Redefined"
890:. Ziff Davis, Inc. – via Google Books.
550:Both variants are equipped with one or more
522:speeds, compared to mechanical hard drives.
116:The performance of a RAM drive is generally
155:(no moving parts). A physical hard drive,
2233:File systems supported by the Linux kernel
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875:. IDG Enterprise – via Google Books.
1077:"Solid-state storage from another angle"
871:Enterprise, I. D. G. (August 15, 1983).
760:Perry S. Kivolowitz (January 21, 1987).
987:"Blast off with Cenatek's Rocket Drive"
598:
1047:"Gigabyte boosts i-RAM speed capacity"
903:
893:
294:History and operating system specifics
886:Inc, Ziff Davis (November 12, 1985).
776:from the original on January 22, 2011
325:natively support RAM drives, as does
240:Because the storage is in RAM, it is
81:. They are in a sense the reverse of
27:RAM used to emulate secondary storage
7:
371:. It was discontinued in Windows 7.
923:"Apple-Compatible Wares Introduced"
103:Historically primary storage based
2228:Solid-state computer storage media
1458:PowerPC accelerator board required
1136:"DDRdrive hits the ground running"
25:
921:Groth, Nancy (January 27, 1986).
355:. VDISK.SYS was not available in
88:It is sometimes referred to as a
762:"ASDG Recoverable Ram Disk News"
494:of storage. At the time, common
1146:from the original on 2018-10-05
1116:from the original on 2018-08-17
1087:from the original on 2018-10-05
1057:from the original on 2018-10-05
1027:from the original on 2018-10-05
997:from the original on 2018-02-03
830:from the original on 2014-10-24
391:added the functionality to the
310:operating system and later for
658:; Perez, Gary; Peters, Chris;
1:
682:. pp. 907–909, 948–951.
567:is for keeping and recording
470:Dedicated hardware RAM drives
280:uninterruptible power supply
1134:Geoff Gasior (2009-03-04).
1075:Geoff Gasior (2009-01-20).
1045:Geoff Gasior (2006-06-06).
1017:"RAM disk without the fuss"
1015:Geoff Gasior (2006-01-25).
2254:
613:. University of California
587:List of RAM drive software
29:
1857:
1454:
985:Mike Chin (2002-11-13).
343:added a RAM drive named
1706:AmigaOS version history
475:released in 1983-1985.
171:) or other media (e.g.
2175:The Battle for Wesnoth
1404:Related and historical
1223:Hyperion Entertainment
46:
2180:Knights and Merchants
1426:The AmigaOS 4 dispute
810:"README for disk 241"
44:
796:"README for disk 58"
749:on December 3, 2013.
733:(January 26, 1987).
608:"RAMDISK Benchmarks"
59:random-access memory
1441:Models and variants
1237:Compatible hardware
731:Perry S. Kivolowitz
527:Gigabyte Technology
504:Gigabyte Technology
321:(with DOS 2.5) and
300:Silicon Disk System
118:orders of magnitude
2140:Origyn Web Browser
1335:Origyn Web Browser
906:has generic name (
858:Kernel Interfaces
716:2018-10-14 at the
411:users can use the
192:maximum throughput
142:maximum throughput
94:software RAM drive
47:
2215:
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1866:
1865:
1756:Amiga Reflections
1470:
1469:
966:(5): 38. May 1986
662:; Pollock, John;
581:Cache (computing)
496:desktop computers
148:characteristics.
98:solid-state drive
90:virtual RAM drive
75:secondary storage
32:solid-state drive
16:(Redirected from
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676:Petzold, Charles
660:Petzold, Charles
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538:ACard Technology
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432:Perry Kivolowitz
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225:in use, such as
177:acoustic storage
57:) is a block of
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664:Reynolds, Aaron
632:Zbikowski, Mark
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393:Apple Macintosh
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250:temporary files
242:volatile memory
173:magnetic bubble
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67:volatile memory
63:primary storage
53:(also called a
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672:Letwin, Gordon
648:McDonald, Marc
640:Ballmer, Steve
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606:Kind, Tobias.
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560:DDRdrive, LLC
556:
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528:
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401:control panel
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377:Multiuser DOS
374:
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323:Commodore 128
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304:Microcosm Ltd
301:
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19:
2205:
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2059:File systems
2047:
1981:Power Mac G5
1971:PowerBook G4
1966:Power Mac G4
1648:File systems
1584:
1514:technologies
1381:ReAction GUI
1354:Technologies
1303:OS4 software
1148:. Retrieved
1139:
1129:
1118:. Retrieved
1110:DDRdrive LLC
1109:
1100:
1089:. Retrieved
1080:
1070:
1059:. Retrieved
1050:
1040:
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999:. Retrieved
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832:. Retrieved
818:
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778:. Retrieved
755:
747:the original
725:
667:
626:
615:. Retrieved
601:
557:
552:CompactFlash
549:
545:
543:
535:
524:
520:
512:
501:
488:Rocket Drive
487:
481:
477:
473:
445:
429:
365:RAMDRIVE.SYS
364:
344:
339:
316:
297:
284:
277:
265:
261:
254:
239:
220:
190:Second, the
189:
150:
115:
105:mass storage
102:
93:
89:
87:
79:flash memory
54:
50:
48:
2017:CyberGraphX
1699:OS versions
1218:Amiga, Inc.
904:|last=
652:O'Rear, Bob
644:Gates, Bill
636:Allen, Paul
385:AmigaOS 4.1
319:Atari 130XE
223:file system
221:Third, the
153:solid state
146:file system
112:Performance
2222:Categories
2190:Robin Hood
2037:TurboPrint
1990:Components
1817:Influenced
1531:AmigaGuide
1521:AmigaBASIC
1366:AmigaGuide
1340:Timberwolf
1150:2018-10-05
1120:2018-10-05
1091:2018-10-05
1061:2018-10-05
1031:2018-10-05
1001:2018-02-03
834:2014-09-30
617:2019-03-21
593:References
531:GC-RAMDISK
399:'s Memory
317:The 128kB
198:, and the
71:disk drive
2200:Stratagus
2195:Quake III
2130:Hollywood
2125:Cubic IDE
1771:Hollywood
1711:AmigaOS 4
1634:Workbench
1580:Kickstart
1575:Intuition
1570:Installer
1446:Kickstart
1436:Intuition
1395:Workbench
1325:Hollywood
1315:Aladdin4D
1204:AmigaOS 4
970:19 August
937:19 August
927:InfoWorld
766:Newsgroup
739:Newsgroup
569:log files
558:In 2009,
536:In 2007,
525:In 2006,
502:In 2005,
492:gigabytes
482:In 2002,
452:Unix-like
441:Fred Fish
421:newfs hfs
357:Microsoft
345:VDISK.SYS
246:encrypted
134:hard disk
51:RAM drive
2112:Software
2032:RAM disk
2007:AmigaDOS
1976:iBook G4
1956:Mac Mini
1908:Hardware
1860:Category
1849:Syllable
1806:AmiZilla
1743:software
1655:CrossDOS
1624:ReAction
1585:RAM disk
1526:AmigaDOS
1462:Category
1361:AmigaDOS
1289:Sam460ex
1284:Sam440ep
1274:AmigaOne
1144:Archived
1114:Archived
1112:. 2014.
1085:Archived
1055:Archived
1025:Archived
995:Archived
896:cite web
888:"PC Mag"
828:Archived
774:Archived
714:Archived
706:16581341
698:87-21452
575:See also
456:/dev/ram
409:Mac OS X
405:Mac OS 9
397:System 7
387:(2010).
331:Apple II
329:for the
216:FireWire
206:(PATA),
196:data bus
55:RAM disk
18:RAM disk
2238:AmigaOS
2206:more...
2185:OpenTTD
2170:Aquaria
2151:more...
2135:NetSurf
2120:Blender
2048:more...
2027:PowerUP
2002:Ambient
1951:Pegasos
1931:A3000UX
1900:MorphOS
1844:MorphOS
1791:WHDLoad
1609:Ambient
1504:AmigaOS
1416:AmigaOS
1330:NetSurf
1320:Blender
1279:Pegasos
1259:A3000UX
933:(4): 56
856:FreeBSD
768::
741::
516:battery
484:Cenatek
464:FreeBSD
436:AmigaOS
381:AmigaOS
185:latency
169:Blu-ray
157:optical
130:optical
2042:WarpOS
1941:A4000T
1926:A3000T
1829:AtheOS
1796:WinUAE
1751:Aminet
1741:Other
1732:AmiKit
1629:Scalos
1599:Amiga
1555:WarpOS
1390:WarpOS
1269:A4000T
1254:A3000T
860:Manual
704:
696:
686:
565:market
423:) and
373:DR-DOS
361:MS-DOS
349:PC DOS
327:ProDOS
312:MS-DOS
287:cramfs
269:kernel
167:, and
161:CD-ROM
159:(e.g,
144:, and
138:floppy
136:, and
2162:Games
1946:Efika
1936:A4000
1921:A3000
1916:A1200
1766:Games
1761:Demos
1536:ARexx
1512:Amiga
1411:Amiga
1371:ARexx
1310:AMuse
1264:A4000
1249:A3000
1244:A1200
956:(PDF)
850:md(4)
611:(PDF)
508:i-RAM
460:Linux
446:Many
425:mount
417:newfs
395:with
36:tmpfs
2092:NTFS
2082:EXT2
2012:CAMD
1961:eMac
1834:BeOS
1824:AROS
1690:NTFS
1639:Zune
1601:GUIs
1565:Hunk
1551:Exec
1546:CAMD
1386:Exec
972:2020
939:2020
908:help
782:2014
702:OCLC
694:LCCN
684:ISBN
450:and
448:Unix
434:for
419:(or
413:hdid
335:/RAM
308:CP/M
227:NTFS
208:SATA
126:tape
2145:YAM
2102:SFS
2097:PFS
2087:HFS
2077:FFS
2072:OFS
2067:FAT
2022:MUI
1997:AHI
1801:YAM
1786:LHA
1781:IFF
1776:ADF
1685:FAT
1680:UDF
1675:SFS
1670:PFS
1665:FFS
1660:OFS
1614:MUI
1590:XAD
1345:YAM
458:on
359:'s
347:to
341:IBM
235:UFS
231:HFS
214:or
212:USB
204:IDE
200:CPU
165:DVD
122:SSD
92:or
65:or
2224::
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894:{{
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Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
