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Where were floppy disks made?
The first floppy disks were made in 1971 for IBM to store System/370 microcode images on, for use during µIPL when starting the machine at powerup. System/370 microcode was stored in fast SRAM chips in the machine, which lost their data when powered off. These floppies were 8 inch diameter and stored only 80KB of data. The same companies that made magnetic tape made floppies.
What are common transfer speeds of Sprint PCS wireless?
There are several ideas on the common transfer speeds of Sprint PCS wireless. However, most of people says that the common transfer speeds of Sprint PCS wireless is around 80KB/ sec.
What type of storage device holds the LEAST amount of information?
The storage device that stores the least amount of information is a floppy disk which only has a average storage space of 1mb
Who invented floppy for IBM?
It was a team effort (no single person). This was an 8 inch diameter floppy without a jacket used to store the microprogram code for various models of the IBM System 370 computer (1971) and had a capacity of only 80KB. It was decided that these floppies did not have to be robust (and were practically considered disposable) as they would rarely be used more than once or twice a day when the computer was first powered on and would be stored away safely the rest of the time.Later when floppies became a common data storage medium on small computers, the floppy had to be made much more robust and reliable and the capacity had to be increased. To improve robustness and reliability the 8 inch floppy was packaged in a stiff jacket with a fabric liner that would clean off and capture dust from the floppy surface. Higher recording density was used. The original FM coding used to read and write data was replaced with MFM coding to double the capacity and some drives could access both sides doubling the capacity again (the highest capacity double sided 8 inch diameter floppy could store 1MB).
What are the advantages and disadvantages of a floppy disk?
The floppy disk was originally developed at IBM for the purpose of loading microcode RAM in their System 370 computers introduced in 1971. As the disk would only be in the drive at most once a day for no more than a couple of minutes then returned to its protective sleeve, there was no concern about wear or exposure to dirt as there was with earlier removable hard discs. When they were first adapted to inexpensive data storage on microcomputers, while these issues now became important nothing was done originally to address them. The primary concern for years was only increasing the data capacity and keeping the cost low. The original IBM 8 inch floppy disks only had a capacity of 80KB, the first microcomputer 8 inch floppy disks increased this to 128KB which was then increased by spacing the tracks closer, doubling the density, and by making use of both sides to: 256KB, 512KB, and finally 1MB. More compact microcomputer 5.25 inch floppy disks were introduced initially had a capacity of 98.5 KB, which was then by a variety of improvements and use of different formatting increased to 110 KB, 360 KB, 720 KB, and finally 1.2 MB. Both the 8 and 5.25 floppy disks provided no protection to the media when outside the drive unless the user put them back in their sleeves (which often got lost). Also the "case" enclosing the floppy disk was itself flexible and this could allow the media to be damaged if it was flexed too much. A new microcomputer 3.5 inch floppy disk was introduced that addressed these issues by using a hard case with a shutter to cover the media when the disk was outside the drive. The most common capacity was 1.44 MB. However the floppy disks are becoming obsolete as Flash based storage devices (e.g. USB, SD, microSD, CompactFlash) have become widely available at low cost and much higher capacity than floppy disks. Flash based storage devices do not have the problems of wear and dirt that have always challenged the Floppy disks (however they do undergo electrical wearout that limits their lifetime).
What are the advantages and disadvantages of a disk?
The floppy disk was originally developed at IBM for the purpose of loading microcode RAM in their System 370 computers introduced in 1971. As the disk would only be in the drive at most once a day for no more than a couple of minutes then returned to its protective sleeve, there was no concern about wear or exposure to dirt as there was with earlier removable hard discs. When they were first adapted to inexpensive data storage on microcomputers, while these issues now became important nothing was done originally to address them. The primary concern for years was only increasing the data capacity and keeping the cost low. The original IBM 8 inch floppy disks only had a capacity of 80KB, the first microcomputer 8 inch floppy disks increased this to 128KB which was then increased by spacing the tracks closer, doubling the density, and by making use of both sides to: 256KB, 512KB, and finally 1MB. More compact microcomputer 5.25 inch floppy disks were introduced initially had a capacity of 98.5 KB, which was then by a variety of improvements and use of different formatting increased to 110 KB, 360 KB, 720 KB, and finally 1.2 MB. Both the 8 and 5.25 floppy disks provided no protection to the media when outside the drive unless the user put them back in their sleeves (which often got lost). Also the "case" enclosing the floppy disk was itself flexible and this could allow the media to be damaged if it was flexed too much. A new microcomputer 3.5 inch floppy disk was introduced that addressed these issues by using a hard case with a shutter to cover the media when the disk was outside the drive. The most common capacity was 1.44 MB. However the floppy disks are becoming obsolete as Flash based storage devices (e.g. USB, SD, microSD, CompactFlash) have become widely available at low cost and much higher capacity than floppy disks. Flash based storage devices do not have the problems of wear and dirt that have always challenged the Floppy disks (however they do undergo electrical wearout that limits their lifetime).
What is the basic history of computer?
from oldest to latest 1936 - z1 computer 1944-Harvard mark 1 computer uses-code encryptions in Germany and Britain CPU basis - a large relay circuit w/ vacuum tubes 1946-ENIAC computer uses-space programs CPU basis - smaller vacuum tubes 1951-UNIVAC computer uses-saving typeing information CPU basis - keycards later analog data tapes w/ vacuum tubes 1971- ODYSSEY game system uses-video game playing CPU basis- silicon chip 150 bit 1973-primitive modems 1974- ATARI 3600 game system uses-video game playing CPU basis - 6502 CPU core 1.2kbit silicon chip 1976- APPLE II computer uses-game and teaching CPU basis - 730KB floppy disk 3.5KB silicon chip 1984-MICROSOFT PC-DOS uses-anything CPU basis - Pentium CPU core 730KB/1.44MB disk 36MB Hard Drive 80KB memory 1985-NES game system uses-video games CPU basis - 6502 CPU core 500KB chip 1991-SEGA game system uses-video games CPU basis - 8-bit ,instrument mod music 1993-SNES game system uses-video games CPU basis - 16-bit, 4MB cartridge 1995-Microsoft WIN-95 uses-anything CPU basis- Pentium II CPU core 2GB HD, 700MB CD-ROM 1995-first world wide web 1996-Nintendo 64 1997-PlayStation CD based game system 2002-X box, PS2 2003- windows XP 100GB HD/ 4GB MEM Pentium 4 2004-I-Mac computer 2006-WIN-vista 2008-PS3, X-box 360, Nintendo WII 2010-WIN-7 1TB HD/ 16GB MEM
