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Basic features, advantages and disadvantages of secondary storage media (Magnetic and Optical)
Haji Yusrizam Tahiron 18 April 2011
Transcript of Basic features, advantages and disadvantages of secondary storage media (Magnetic and Optical)
present................................. Basic Features, advantages and disadvantages of secondary storage
(Magnetic and Optical) Magnetic secondary storage media is often used when large amounts of data need to be backed up. Examples : Floppy Disk and Hard Drive While optical includes compact disc like CD-ROM, CD-RW, DVD and Blu-Ray. They store Digital data as pits on the surface of a reflective Disc. A laser is moved accross the surface of the disk and the length of the reflected beam is used to read the data. Things well Cover on this presentation: zip drive Floppy disk magnetic tape Hard drive Flash Drive Magnetic Optical CD rom CD-RW and DVD Magnetic tape : Typical size = 100mb A recording medium consisting of a thin tape with a coating of a fine magnetic material, used for recording analogue or digital data. Data is stored in frames across the width of the tape. The frames are grouped into blocks or records which are separated from other blocks by gaps. Advantages:
1. Can store a lot of data
2. Not easily damaged
3. Can be used overnight to back up a data system Disadvantages:
1. Takes a long time to load data into it
2. Have to go through the tape to get the data you want (serial Access)
3. Only allow serial access
Floppy disk A floppy disk is a data storage medium that is composed of a disk of thin, flexible ("floppy") magnetic storage medium sealed in a square or rectangular plastic carrier lined with fabric that removes dust particles. Advantages:
1.Small thin and lightweight so easy to carry around.
2.Can be reused but data can’t be overwritten only deleted to create space.
1. Can’t store that much and one big picture will take up a lot of space.
2.It’s thin so it could get damaged easily.
3.Read/write head actually makes contact with the floppy disk, this reduces the lifespan of a disk and increases the chances of data corruption.
4.Not compatible with most modern PCs
Hard Disk A hard disk drive (HDD) is a non-volatile, random access device for digital data. It features rotating rigid platters on a motor-driven spindle within a protective enclosure. Data is magnetically read from and written to the platter by read/write heads that float on a film of air above the platters. Advantages:
1. Main Backing storage for files and programs.
2. Can store lots of data compared to the floppy disc.
3. Can have a second hard disk as back-up storage.
1.Slow to access when compared to RAM.
2.Data can be damaged if the head crashes onto the platter.
3.Magnetic tape is a serial access medium, similar to an audio cassette, and so data (like the songs on a music tape) cannot be quickly located.
Zip drives (Typical size=100MB)
The Zip drive is a medium-capacity removable disk storage system that was introduced by Iomega in late 1994. Zip drive is larger and thicker than normal floppy disk but work in pretty much the same way. Originally, Zip disks launched with capacities of 100 MB, but later versions increased this to first 250 MB and then 750 MB.
zip drives Advantages:
1.Can hold more data than a floppy disk.
2.It is good for backing up important files compared to floppy disk.
3.Large storage capacity
4.Disks are durable, robust and rewriteable
1.Much more expensive than a floppy disk.
2.You need a special drive to read the disk. CD-ROM (650MB) CD-ROM is read-only disk which means that you can read the data off the disk but it can’t be altered or store new data. Software is usually sold on CD-ROM.Data can only be read and not written nor erased.
1.Data cannot be
2.Easy to carry around.
3.Cheap to produce.
4.Can be read by a DVD drive.
2.Can scratch easily- this effects the data when the laser reads it.
3.Slower to access than a hard drive. CD-RW
In CD-RW, data can be deleted and new data can be written onto the disk. RW stands for Read and Write.
1. Can add new data onto the disk
2. Old data can be deleted
3. Can read discs made by different CD-R and CD-RW devices
4. CD-RW’s media can be written/erased over and over
5. CD-RW devices can write to both CD-R and CD-RW media
1. Some older computers cannot read CD-RW media
2. Increased overhead – less usable space due to the multiple table of contents, fixed or variable length packets
3. CD-RW drives are slower than CD-R drives by 2X
4. Backward computability issues due to lower emulation of the pits and lands
5. Areas can get burned out
DVD (Typical size=5-17GB)
DVD stands for Digital Versatile Disk. It is like a CD but hold much more data. As a result it can store whole films digitally. DVDs offer higher storage capacity than compact discs while having the same dimensions.
1.Superior picture quality, CD-quality audio and surround sound.
2.Far easier to search through discs thanks to built-in menu systems and disc segmented into “chapters”
3.CD-sized discs are far more portable than VHS tapes.
4.Added extra included with DVD movies such as interviews with the stars and behind-the-scenes documentaries.
5.Large storage amount.
6.Does not transmit viruses.
7.The prices are getting cheaper.
8.Good for storing films.
1.Doesn’t work in CD ROM drives.
2.More expensive than CD-ROM.
THE END Wait!.......There's one more thing Flash drive (Size=2-18GB) Flash Drives are small and portable flash memory devices. They plug into a computer’s USB port and function as a portable hard drive.Flash Drives are also called Thumb Drives, Flash Drives, Pen Drives, Jump Drives, Memory Stick and even Key Drives. A flash drive is a small storage device that can be used to transport files from one computer to another. They are slightly larger than a stick of gum, yet many of these devices can carry all your homework for an entire year! You can keep one on a key chain, carry it around your neck, or attach it to your book bag. Advantages:
1. USB Flash drives are readily affordable and cost less per megabyte than the previously ubiquitous floppy disk.
2. They are also more reliable that floppy disks, and can be easily carried in a pocket or around one's neck.
3. They offer a large storage capacity without the inconvenience of transporting an external hard drive.
1.Due to their small size, they can easily be misplaced or lost.
2.It can even be infected by viruses.
3.Depending upon the quality of the USB Drive, they can sustain only a limited number of write and erase cycles before they fail. Normally they can support a few hundred thousand such cycles.
4.Most USB Drives do not have a write-protect system. This can make computers open to virus attacks. typical size : 1.44mb