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PostSubject: Fast Ibm Disk Storage.   Tue Sep 27, 2011 4:34 pm

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IBM 350 IBM 305 by U. S. Army White River Arsenal, with two IBM 350 disk drives in your foreground. RAMAC mechanism located at Computer History Museum That IBM 350 disk safe-keeping unit, the first file drive, was announced by IBM being component of the IBM 305 RAMAC home pc system on September 13, 1956. Simultaneously an awfully similar product, the "IBM 355 Haphazard Access Memory" was announced for ones IBM 650 computer method. RAMAC stood for "Random Access Manner of Accounting and Control. " Its design was motivated by your need for real time accounting operating. The 350 stored 5 thousand 7-bit (6-bits plus 1 occasional parity bit) characters (about 3. 4 megabytes). It previously had fifty 24-inch (610聽mm) dimension disks with 100 tracking surfaces. Each surface acquired 100 tracks. The hard disk drives spun at 1200 RPM. Data files transfer rate was 8, 500 characters per second. Two independent access arms moved top to bottom to select a dvd and in and out to purchase a recording track, virtually all under servo control. A 3rd arm was added as being a definite option. Several improved models were added in your 1950s. The IBM RAMAC 305 model with 350 disk storage containers leased for $3, 200 phone. The 350 was technically withdrawn in 1969. Typically the 350's cabinet was 61 inches (152 cm) much time, 68 inches (172 cm) superior and 29 inches (74 cm) great. IBM had a strict rule that all those its products must tolerate a standard 29. 5 in (75 cm) doorway. Considering that 350's platters were attached horizontally, this rule presumably dictated the highest level diameter of the devices. Currie Munce, research vice director for Hitachi Global Storage containers Technologies (which has purchased IBM's storage business), stated in any Wall Street Journal interview of the fact that RAMAC unit weighed more than a ton, had to end up moved around with forklifts, not to mention was delivered via great cargo airplanes. According to be able to Munce, the storage capacity of the drive happens to be increased beyond five megabytes, but IBM's marketing department back then was against a higher capacity drive, because they didn't recognize how to sell a product to comprehend storage. As of 2006, typically the Computer History Museum during Mountain View, California has a RAMAC hard drive drive mechanism (without original control circuitry) which is using this method of being restored. IBM 353 The IBM 353 attached to the IBM 7030, was vehicle IBM 1301, but accompanied by a faster transfer rate. It again had a capacity for 2, 097, 152 (221) 72-bit written text (64 data bits plus 8 ECC bits) together with transferred 125, 000 written text per second. IBM 355 Typically the IBM 355 was declared on September 14, 1956 for being an addition to the famous IBM 650. It used an identical mechanism as the IBM 350 and also stored 6 million 7-bit decimal digits. Data was transferred to and from IBM 653 magnetic foremost memory, an IBM 650 opportunity that stored just 60 years of age 10-digit words, enough on a single sector of disc or tape data. IBM 1405 The IBM 1405 File Storage Unit was declared by 1961 and was developed for use with the IBM 1401 chain, medium scale business pc's. The 1405 stored 10 million characters using one module. Each module acquired 25 large disks, glorious 50 recording surfaces. Typically the disks spun at 1200 rpm. Typically the Model 1 had a person module, the Model a couple of had two modules, piled vertically. Each recording surface area had 200 tracks together with 5 sectors per watch. Data was read and also recorded at 22, 500 individuals per second. A single arm gone in and out and top to bottom. Access time ranged coming from 100 to 800 milliseconds (Model 2). IBM 1301 Typically the IBM 1301 Disk Safe-keeping Unit was announced regarding June 2, 1961. It's designed for use with all the IBM 7000 series mainframe computers as well as IBM 1410. The 1301 stored 28 million characters using one module (25 million along with the 1410). Each module acquired 20 large disks and even 40 recording surfaces, with the help of 250 tracks per outside. The 1301 Model 1 acquired one module, the Device 2 had two segments, stacked vertically. The hard disk drives spun at 1800 rpm. Data files was transferred at 75, 000 characters per next. A major advance on the IBM 350 and IBM 1405 was having a separate arm and head every recording surface, with lots of the arms moving in and out together similar to a big comb. This eliminated the moment needed for the arm to pull the pinnacle out of one disk and progress or down to an alternative disk. Seeking the wished-for track was also more quickly since, with the different design, the head would usually be somewhere having the disk, not starting at the outer edge. Maximum discover time was reduced to help you 180 milliseconds. The 1301 also featured heads that aerodynamically designed to fly over the top of disk on a small layer of air. This allowed it to be much closer for the recording surface, which really improved performance. The 1301 was powering the computer via any IBM 7631 File Manipulate. Different models of the 7631 allowed the 1301 that they are used with a 1410 or maybe 7000 series computer and / or shared between a 7000 in addition to a 1410 or between only two 7000's. The IBM 1301 Device 1 leased for $2, 100 phone or could be paid for for $115, 500. Prices for ones Model 2 were $3, 500 phone or $185, 000 to find. The IBM 7631 controller cost a second $1, 185 per calendar month or $56, 000 to find. All models were taken in 1970. IBM 1302 Typically the IBM 1302 Disk Safe-keeping Unit was introduced during September 1963. Improved recording quadrupled it has the capacity over that of this 1301, to 117 million dollars 6-bit characters per component. Average access time was initially 165 ms and data is often transferred at 180 E characters/second, more than double the speed for the 1301. A second arm accessed a unique group of 250 tracks. As with the 1301, there would be a Model 2 with twice the proportions. The IBM 1302 Device 1 leased for $5, 600 phone or could be picked up for $252, 000. Prices for ones Model 2 were $7, 900 phone or $355, 500 to find. The IBM 7631 controller cost a second $1, 185 per calendar month or $56, 000 to find. The 1302 was withdrawn in February 1965. IBM 1311 IBM 1311 Dvd Drives - Model a pair of (Slave) &amp; Model 3 (Master). Typically the IBM 1311 Disk Safe-keeping Drive was announced regarding October 11, 1962 and was developed for use with several medium-scale online business and scientific computers. The 1311 was about the existing décor of a top-loading appliance and stored 2 million characters at a removable IBM 1316 hard drive pack. Each disk bunch was 4聽inches (100聽mm) huge, weighed 10 pounds (4. 5 kg) not to mention contained six 14-inch (360聽mm) dimension disks, yielding 10 recording surface types (the outer surfaces wasn't used). The 10 individual R/W heads were that come with a common actuator that has been moved in and released hydraulically and mechanically detented along at the desired track before checking or writing occurred. Typically the disks spun at 1500 rpm. Every different recording surface had 100 moves with 20 sectors every track. Each sector kept 100 characters. Seven types of the 1311 were introduced usually in the 1960s. They were withdrawn usually in the early 1970s. Models for the 1311 disk drive Has to be drive 1 on a powerful IBM 1440, IBM 1460, and / or IBM 1240 system. Provides the controller and can control around 4 Model 2 forces. Introduced October 11, 1962. Pulled February 8, 1971. Servant drive. Could have any special feature incorporated of the fact that master drive (drive 1) had incorporated. Introduced October 11, 1962. Pulled January 6, 1975. Is required to be drive 1 on some sort of IBM 1620 or IBM 1710 product. Contains the controller and that can control up to 3 Device 2 drives. Did not necessarily support any special options. Introduced October 11, 1962. Pulled May 12, 1971. Is required to be drive 1 on some sort of IBM 1401 system. Provides the controller and can control around 4 Model 2 forces. Introduced October 11, 1962. Pulled February 8, 1971. Is required to be drive 1 on some sort of IBM 1410, IBM 7010, and / or IBM 7740 system. Provides the controller and can control around 4 Model 2 forces. Direct Seek comes standard on that model. Introduced January 7, 1963. Pulled May 12, 1971. Certainly no information available, probably a fabulous master drive (drive 1). Invented March 5, 1968. Pulled February 2, 1971. <! --INFOLINKS_OFF-->



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Certainly no information available, probably a fabulous master drive (drive 1). Invented March 5, 1968. Pulled February 2, 1971. Typically the optional special features were definitely Direct Seek: Without excessive every seek returned to help you track zero first. Read Disk: Automatic rapid seek identifier or condition. Search Overlap: Allowed a seek that will overlap ONE read or write and various other seeks. Track Document: Increased the capacity for the disk by writing YOU large record per track as opposed to using sectors. Drive 1 (the leader drive: models 1, 3, check out, and 5) was upto a foot wider than one other drives (the slave drives: model 2), to contain extra power supplies and then the control logic. The IBM 1316 Disc Packs were covered accompanied by a clear plastic shell along with bottom cover when not utilized. A lifting handle in your top center of the cover was rotated release a the bottom cover. Then the the top 1311 drive was opened as well as the plastic shell was lowered on the disk drive opening (assuming it had become empty). The handle was changed again to lock the disks set and release the clear plastic shell, which was then removed and therefore the drive cover closed. The approach was reversed to do away with a disk pack. IBM 2311 IBM 2311 storage area unit, with its half dozen platters. The IBM 2311 Immediate access Storage Facility was created in 1964 for use within the System/360 series. It was also on the IBM 1130 together with (using the 2841 Manipulate Unit) the IBM 1800. The 2311 mechanism was largely identical in the 1311, but recording advancements allowed higher data occurrence. The 2311 stored 7. 25 million bytes using one removable IBM 1316 hard drive pack (the same type come with the IBM 1311) composed of six platters that rotated for a single unit. Each recording surface have 200 tracks plus 3 optional tracks which sometimes be used as alternatives in the event faulty tracks were noticed. Average seek time appeared to be 85 ms. Data convert rate was 156 kB/s. The 2311 had 10 individual R/W heads that come with a common actuator that has been moved in and released hydraulically and mechanically detented along at the desired track before checking or writing occurred. Typically the 2311 was organized within cylinders, tracks, and notes. (A cylinder referred to any or all surfaces the same track on each 5 platters. ) Log 0 was reserved to get timing. Because the 2311 was being used with quite a few computers within the 360 products, its electrical interconnection has been standardized. This created a way for other manufacturers to provide plug compatible disk propels for use with IBM computers and a complete industry was born. IBM 2314/2319 Typically the IBM 2314 Disk Accessibility Storage Facility was created on April 22, 1965, yearly later after the System/360 arrival. It was used with all the System/360 and the System/370 creases. With Two Channel Switch feature it may well interface with two 360/370 signals. The 2314 Disk access mechanism was vehicle 2311, but further saving improvements allowed higher records density. The 2314 put away 29, 176, 000 characters (200207294 bytes per track) using one removable IBM 2316 disk pack that's similar in design into the 1316 but was taller by means of increasing the number from disks from six towards eleven. The 2316 cd pack containing the nine 14-inch (360聽mm) diameter hard disks yielded 20 recording surfaces. The drive access was comprised of 20 individual R/W heads that come with a common actuator that's moved in and over hydraulically and mechanically detented within the desired track before perusing or writing occurred. Every different recording surface had 150 tracks. Access time was initially very much like the 2311, but later models were faster by means of improvements made in the particular hydraulic actuator. Data convert rate was doubled to help you 310 kB/s. The original Model 1 was comprised of the 2314 control product, a 2312 single push module, and two 2313 four drive modules on a total of 9 cd drives. Only eight drives of this nine were available for the user at any single time. The ninth drive was there in a spare for the user and is also worked on 'offline' utilizing a Field Engineer while one other drives were in use via the customer. Each of the on the lookout for drives were mounted in individual drawers who were unlatched and pulled out to locate the Disk Pack. Because of the appearance they picked up the nickname of 'Pizza Ovens' Some other 2314 Models came later: 2314 Model A with combinations of merely one to nine drives. 2314 Model B by using 2319 disk drives were for three, six and eight drive models. A 2844 Control Unit is often added to the 2314 Handle Unit which allowed a few S/360 Channels simultaneous admission to two separate disk drives during the Storage Facility. IBM 2310 The IBM 2310 Extractible Cartridge Drive was announced in 1964 aided by the IBM 1800 and then in 1965 with all the IBM 1130; it likely first shipped aided by the 1130 in late 1965. It may well store 512, 000 written text (1, 024, 000 bytes) you are using IBM 2315 cartridge. A person 14-inch (360聽mm) oxide-coated aluminum disk spun within the plastic shell with openings for your read/write arm and only two heads. IBM 2321 The IBM 2321 Info Cell was announced in April 1964 for being an IBM System/360 component. The 2321 housed roughly ten removable and compatible data cells. Each statistics cell contained 200 bunches of magnetic tape, that were the basic recording storage devices. The total storage power was 400 million bytes or possibly 800 million decimal digits. Up to eight 2321s might attached to the IBM 2841 control unit, allowing an over-all capacity of over 3 GB. Reportedly the Cell required 23 liters in motor oil. It was a prospering device -- not withstanding all the complex mechanical movements to choose read and return a strip to the bin. In comparison for the contemporary IBM 2311 Storage Device, the IBM 2321 Statistics Cell Device held second 55 times more data, whereas being only 6 moments slower (85ms and 500ms connection times respectively). One well loaded IBM 2841 Regulate Unit with eight IBM 2321 Info Cell Devices would demand and equivalent of 441 IBM 2311 Disc Devices, with 56 IBM 2841 Manipulate Units. The Data Cell took 3 concurrently operating independent seeking systems; a servo-hydraulic people to rotate the bins to decide the proper subcell, not to mention two solenoid driven models; one to select the appropriate strip tab of the 10 with the subcell, and the other to select one of the many 5 head positions, for ones 20 element head (110 Rails per strip). Because the country's storage medium was record, many observers would not check out 2321 a disk push. However, IBM's System 360 computer itself addressed the 2321 in the form of rotating direct access storeroom devices, e. g., some disk drive, with a 6-byte seek address for the form 0BBSCH where the earliest byte is zero and also remaining bytes address that Bin (i. e cell), Compost bin, Strip, Cylinder and Brain. The 2321 was whimsically termed the "noodle picker" as being the removable magnetic strips happen to be flexible and resembled lasagna noodles. IBM 3330 200 MB detachable disk pack without defending cover The IBM 3330 Immediate access Storage Facility, code-named Merlin, was introduced in August 1970 for use aided by the IBM System/370 and that IBM System 360/195. Her removable disk packs put on 100 MB (404x19x13, 030 bytes) (the 1973 Brand 11 featured IBM 3336 Hard drive Packs that held 150 MB (808x19x13, 030 bytes)). Easy access time was 30 master of science and data transferred located at 806 kB/s. A major advance introduced with all the 3330 was having error correction, which made the forces more reliable and minimal costs because small imperfections in your disk surface could become tolerated. The circuitry could correct error bursts roughly 11 bits long. Typically the 3330 was withdrawn around 1983. IBM 3340 The IBM 3340 Immediate access Storage Facility, code-named Winchester, was basically introduced in March 1973 meant for use with IBM System/370. Its removable disk bags were sealed and included your head and arm assembly. There would be no cover to remove through the insertion process. Access effort was 25 millisecond together with data transferred at 885 kB/s. Three versions of this removable IBM 3348 Records Module were sold, a particular with 35 megabyte total capacity, another with 70 megabytes, finally also had 70 megabytes, and yet with 500 kilobytes beneath separate fixed heads meant for faster access. The 3340 equally used error correction. It's withdrawn in 1984. The 3340 began in San Jose inside leadership of Ken Haughton. Initially the design was dedicated to two removable 30 megabyte segments. Because of this 30/30 construction, the code name Winchester was selected when the famous Winchester 30-30 gun; subsequently the capacities ended up being increased, but the computer code name stuck. The significance from this product, and the reason that disk drives usually became known as "Winchester technology" had nothing about the configuration of your handmade jewelry. This was IBM's first drive in order to unload the heads from your media. The Winchester technology allowed your head to land and lose from the disk media when the disk spun top to bottom. This resulted in very significant savings along with large reduction of complexity with the head and arm actuating process. This rapidly became a common design within the cd manufacturing community. IBM 3350 The IBM 3350 Immediate access Storage Facility, code-named This town, was introduced in 1975 to get use with IBM System/370. Its non-removable disk features were sealed and included your head and arm assembly. Typically the 3350 disk geometry has been 555 cylinders, 30 managers, and 19069 bytes every track which gave your head Disk Assembly (HDA) a fabulous storage capacity of 317, 498, 850 bytes. Disk units were known as A2, A2F, B2, B2F, C2, not to mention C2F. Each unit contained two HDAs so they were installed in "strings" about units. An A2 or A2F machine was required and linked with a "control unit" for instance the IBM 3880. After the A2 could depend on 3 B2 units or 2 B2s plus a C2. The C2 unit is also connected to a control unit obese it in place afterward two I/O operations is usually executed on the string too. The "x2F" unit was a natural x2 unit, but its two HDAs at the same time had a "Fixed Head" area during the first 5 cylinders. This Fixed Head area was that will be allocated to that HASP or JES2 checkpoint area and for that reason would greatly reduce head motion in the device. In the background with this photograph of a 3350 A2/B2/B2 string is definitely IBM 3066 console, attached to the IBM 370/165 and also 370/168 computers. IBM 3370 and 3375 IBM announced the IBM 3370 Immediate access Storage Device in January 1979 now for the for IBM 4331, 4341, not to mention System/38 midrange computers. It again had 7 fixed 14-inch (360聽mm) drives, and each unit obtained a capacity of 571 MB. It's the first HDD using thin film head concept; research on that know-how started at Thomas T. Watson Research Center in your late 1960s. The 3370 was a restricted block architecture. The related unit was called that 3375 and used all the count-key-data architecture. IBM 3380 IBM 3380 dvd drive module. The IBM 3380 Immediate access Storage Device was brought in in June 1980. It again used new film venture technology and had a fabulous capacity of 2. 52 gigabytes accompanied by a data transfer rate in 3 megabytes per next. Average access time appeared to be 16 ms. Purchase value at time of guide ranged from $81, 000 towards $142, 200. Due to be able to problems encountered, the first units will not ship until October, 1981. IBM 3390 The IBM 3390 Immediate access Storage Device series is introduced November 1989, offering a maximum storage up to 22 gigabytes in a fabulous string of multiple propels. Cost of a storage containers system varied by arrangement and capacity, between $90, 000 not to mention $795, 000. A Model 3 enhancement in the drive family, announced Sept 11, 1991, increased efficiency by approximately 1. 5 and then a Model 9 family, launched May 20, 1993, further increased capacity by one additional factor of 3 to make sure you minimum capacity of 34 gigabytes available as one drive box. The 3390 Model 9 was the third Single Large Expensive Hard drive (sometimes called SLEDs) dr announced by IBM. Typically the floppy disk drive Find also: History of the floppy disc Another important IBM innovation certainly is the Floppy Disk Drive. IBM first introduced a 8-inch Floppy Disk Drive in 1971 being read only program load device. In 1973 IBM sent its first read/write floppy disk drive implementingwithin the 3740 Data Connection System. IBM established early benchmarks in 8" Floppy Disc Drives but never offered for sale such products separately in order that the industry then developed different from IBM. Disk memory space in 2004 IBM bought its disk drive functioning to Hitachi in 2002. For the purpose of comparison purposes, the Hitachi Deskstar 7K250 PC computer stores 250, 000, 000, 000 bytes (250 gigabytes) concerning three 3. 5-inch (90 mm) length platters spinning at 7200 rpm. It includes a sustained average send rate of 61, 700, 000 bytes per second during a serial ATA bus. Usually the seek time is 8. 5 milliseconds. It again weighs 640 grams (1. check out lb). Like all 3. 5-inch hardrives, it is about on condition that the carrying handle upon an IBM 1316 disk bunch. Retail price in August 2006 was about US$100. See also History of pushes List of IBM magnets disk storage products Records ^ "CHM HDD Occurrences: IBM 350 RAMAC". http: //chmhdd. wetpaint. com/page/IBM+350+RAMAC. Reclaimed 2009-05-22. 聽 ^ IBM RAMAC market film ^ IBM 350 hard drive storage unit ^ Shelter Gomes, "Talking Tech" Typically the Wall Street Journal, Aug 22, 2006 ^ IBM Expanse (aka IBM 7030 Statistics Processing System) ^ IBM 355 file storage unit ^ IBM 1405 storage storage ^ IBM the past page on 1301 ^ IBM 1311 Hard drive Storage Drive (PDF) ^ IBM 1800 knowledge acquisition and control model, IBM Archives states Nov 30, 1964 ^ IBM INITIATES POWERFUL SMALL COMPUTER, Feb . 11, 1965 ^ IBM Microfilm - 2321 data mobile phone drive ^ a d IBM System Reference Study, IBM System/360 Component Grammar, Form A26-5988 ^ "IBM 3340 immediate access storage facility". IBM. http: //www-03. ibm. com/ibm/history/exhibits/storage/storage_3340. html. Reclaimed 2009-01-21. 聽 ^ http: //www-03. ibm. com/ibm/history/exhibits/storage/storage_3370. html ^ http: //www. ibm. com/ibm/history/exhibits/storage/storage_3380. html ^ IBM Microfilm see also: 1994 Disk/Trend State, Rigid Disk Drives to get family capacities ^ http: //www. internetnews. com/infra/article. php/1183321 External links IBM Archive's Family table Of Links To Hard drive Drive Articles Magnetic Hard drive Heritage Center The IBM 350 RAMAC Disk File 25 percent Century of Disk Register Innovation IBM Journal involving Research and Development, 1981 (PDF) IBM 1311 from the Thessaloniki Science Center &amp; Products Museum 50th Anniversary: The IBM 305 RAMAC and then the IBM 350 Disk Storage area Unit hit 50 EE Circumstances: Disk drives take eventful spin Yoshiro Nakamatsu and then the Floppy Disk IBM storage storage documents on bitsavers. org (PDF) IBM 1311 Cd storage drive IBM 2314 Immediate access storage Floppy Categories: Back ground of computing hardware | IBM storage containers devices | Rotating disk computer storage mediaHidden categories: Articles containing potentially was involved with statements from 2004 | Most of articles containing potentially dated statements <! --INFOLINKS_OFF-->.
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