SECONDARY STORAGE

BY: ESAP.P

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.

Types of Storage

Hard disks

Optical disks

Floppy disks

Magnetic tape

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.

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.

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

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.

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

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

• 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

Other Types of Secondary Storage

•Solid-state storage

•Internet hard drives

•Magnetic tape

THANK YOU