removable media up
DESCRIPTION
optical disk, memory card, floppy diskTRANSCRIPT
HEMANTH RAJ ([email protected])
HEMANTH RAJ ([email protected])
in computer storage, removable media refers to storage media which is designed to be removed from the computer without powering the computer off.Some types of removable media are
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1. Optical discs (Blu-ray discs, DVDs, CDs)
2. Memory cards (CompactFlash card, Secure Digital card, Memory Stick)
3. Floppy disks
4. USB flash drives
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• The optical disc was invented in 1958• In 1961 and 1969, David Paul Gregg registered
a patent for the analog optical disc for video recording
• In the mid-1990s, the second generation of the optical disc, the DVD manufactured
• The third generation optical disc was developed in 2000-2006
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• introduced as Blu-ray Disk. Developed by the Blu-ray Disc Association (BDA)
• a group of the world's leading consumer electronics, personal computer and media manufacturers (including Apple, Dell, Hitachi, HP, JVC, LG, Mitsubishi, Panasonic, Pioneer, Philips, Samsung, Sharp, Sony, TDK and Thomson)
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HEMANTH RAJ ([email protected])
• Blu-ray is the name of a next-generation optical disc format
• developed by the Blu-ray Disc Association (BDA)
• The format was developed to enable recording, rewriting and playback of high-definition video (HD), as well as storing large amounts of data.
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• The format offers more than five times the storage capacity of traditional DVDs and can hold up to 25GB on a single-layer disc and 50GB on a dual-layer disc.
• the Blu-ray format uses a blue-violet laser instead of red laser to read and write data
• Blu-ray is currently supported by about 200 of the world's leading consumer electronics, personal computer, recording media, video game and music companies.
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• There are three competing DVD Recording standards are…
1. DVD-ROM (read only memory) has data that can only be read and not written
2. DVD-Rand DVD+R (recordable) can record data only once, and then function as a DVD-ROM
3. DVD+RW, and DVD-RAM (random access memory) can all record and erase data multiple times.
• The storage capacity of DVD is up to 4.37 GB
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• DVD also known as Digital Video Disc or Digital Versatile Disc
• DVD is an optical disc storage media format, and was invented and developed by Philips, Sony,Toshiba, and Time Warner in 1995.
• Its main uses are video and data storage.• DVDs are of the same dimensions as compact
discs (CDs), but are capable of storing just under seven times as much data
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HEMANTH RAJ ([email protected])
• A Compact Disc (also known as a CD) is an optical disc used to store digital data.
• It was originally developed to store sound recordings exclusively.
• but later it also allowed the preservation of other types of data.
• Audio CDs have been commercially available since October 1982.
• Standard CDs can store 700 MB of data
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• In 2010, they have been largely replaced by other forms of digital storage.
• audio CD sales dropping nearly 50% from their peak in 2000
• Types of Compact Disc 1. write-once audio and data storage CD-R 2. rewritable media CD-RW,3. Video Compact Discs (VCD)4. Super Video Compact Discs (SVCD)
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• A memory card or flash card is an electronic flash memory data storage device used for storing digital information
• They are commonly used in many electronic devices, including digital cameras, mobile phones, laptop computers, MP3 players, and video game
• They are small, re-recordable
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• they can retain data without power.• The most common type of memory card in use
today is the SD card• which comes in capacities of up to 64
Gigabytes.• Major Types of Memory card are…
1. CompactFlash card 2. Secure Digital card 3. Memory Stick
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• CompactFlash (CF) is a mass storage device format used in portable electronic devices.
• The format was first specified and produced by SanDisk in 1994
• The physical format is now used for a variety of devices.
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• CompactFlash became the most successful of the early memory card formats
• It can store 2 MB to 128 GB• It is used in Digital cameras and other mass
storage devices
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• Secure Digital (SD) is a non-volatile memory card format developed by Panasonic, SanDisk, and Toshiba for use in portable devices.
• It is widely used in digital cameras, digital camcorders, handheld computers, netbook computers, PDAs, media players, mobile phones, GPS receivers, and video game consoles.
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• Standard SD cards have an official maximum capacity of 2 GB, though technically they can store up to 4 GB
• SDHC (High-capacity) cards have a maximum capacity of 32 GB.
• SD cards typically have transfer rates in the range of 80–160 Mbit/s
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• Memory Stick is a removable flash memory card format, launched by Sony in October 1998
• It can store 4 MB to 32 GB• Memory Sticks are used as storage media for a
portable device like digital cameras, digital music players, PDAs, cellular phones, laptop computers, and the PlayStation Portable
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• Memory Sticks include a wide range of actual formats
1. Memory Stick PRO
2. Memory Stick Duo
3. Memory Stick PRO Duo
4. Memory Stick Micro (M2)
5. Memory Stick XC
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• floppy disk is Invented by the American information technology company IBM
• A floppy disk is a data storage medium that is composed of a disk of thin, flexible magnetic storage medium encased in a square or rectangular plastic shell.
• loppy disks are read and written by a floppy disk drive or FDD
• floppy disks in 8 inch, 5¼ inch and 3½ inch
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Internal parts of a 3 1/2 inch floppy disk. • 1 is a hole that indicates a high-capacity disk.• 2 is the hub that drives 6, the magentic coated
plastic disk.• 3 is a shutter that protects the surface when
removed from the drive.• 4 is the plastic housing.• 5 is a polyester sheet that allows the disk
media to rotate within the housing.• 6 sector of data on the disk• 7 is a schematic representation of one sector of
data on the disk; the tracks and sectors are not visible.
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• Trek Technology and IBM began selling the first USB flash drives commercially in 2000.
• The Singaporean Trek Technology sold a model under the brand name "ThumbDrive", and IBM marketed as "DiskOnKey“
• USB flash drives are typically removable and rewritable
• USB flash drive weigh less than 30 g
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• Storage capacities in 2010 as large as 256 GB
• USB drives with USB 2.0 support can store more data and transfer faster than a much larger optical disc drive
• Most USB flash drives draw their power from the USB connection, and do not require a battery.
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1. USB connector2. USB mass storage
controller device3. Test points4. Flash memory chip5. Crystal oscillator6. LED7. Write-protect switch
(Optional)8. Space for second
flash memory chip