secondary storage (ppt)esap.p
DESCRIPTION
Secondary StorageTRANSCRIPT
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SECONDARY STORAGE
BY: ESAP.P
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Secondary Storage
• Its Stores information.
• Direct Access Storage Devices.
1. Floppy Disk Drive (FDD).
2. Hard Disk Drive (HDD).
3. Optical Disk
• Sequential access storage devices and
media(SASD).
1. Magnetic tape.
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Types of Storage
Hard disks
Optical disks
Floppy disks
Magnetic tape
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Floppy Disks
• Portable and removable.• Magnetic charge on metal- oxide film coating.• capacity on 1.44MB to 2.88MB. • Access drive speed 600 r.p.m.• Its is used for small amount of data.• Less cost.
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Hard Disks• It is a secondary storage.• It is used to stored the data's.• t’s a magnetic material.•The information stored in 0(or)1.• Inverted in IBM company in 1954.• Higher capacity than floppy.• Access drive speed 5,400-7,200. r.p.m.
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Optical Disks CD(compact disk) DVD(Digital Versatile Disk)
CD (Compact Disk)• Density:16.000 dpi (Dot per inch).• Speed in 150KB/s to 6MB/S.• Size up to 650MB upto 1GB.• Rotational speed = data transfer time. Types of CD’s CD-R CD-RW
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CD-R• Compact disk – Read.• Disks are “Burnt” one at a time.• Written to once• Custom made music CDsCD-RW• Compact disk-Read and Write.• Erased , Write upto 1000 times.
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DVD• Digital Versatile Disk.
• Rapidly replacing CD’s.
• Higher capacity.
• 17 times the capacity of a CD.
DVD types
DVD-ROM• Read only memory
DVD-R • Recordable
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DVD-RAM or DVD-RW• Competing rewritable formats
• Sequential access
• Commonly used for backing-up data
• Very large capacity
Magnetic Tape
Magnetic Tape Types Tape cartridges Magnetic tape reels
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• Backup tape for microcomputer • Capacities range from 120 MB to 5 GB• Digital audio tape (DAT)
Tape reels• Minicomputer and mainframe• 1/2 inch wide and 1/2 mile long• Stores 1600 to 6400 cpi
Tape cartridges
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Other Types of Secondary Storage
•Solid-state storage
•Internet hard drives
•Magnetic tape
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