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Secondary Storage (TERMINOLOGIES (Storage (Holds data, instructions, and …
Secondary Storage
TERMINOLOGIES
Storage
Holds data, instructions, and
information for future use
Storage
medium
Physical material used for storage.
Also called secondary storage and nonvolatile
Storage
device
Hardware that records and
retrieves items to and from storage media
Reading
transferring items from a
storage medium into memory
Writting
transferring items from
memory to a
storage medium
Capacity
Number of bytes a
storage medium can hold
Magnetic Disks Storage
Diskettes
Hard Disks
Data Organization on Disks
TRACK - magnetic concentric
circle on the disk surface
SECTOR - short segment of track
when disk surface is
divided into pie-shaped.
Cylinder Method
Disks Acces Time
Head Switching
Rotational Delay
Seek Time
Benefits
Space
Store a roomful of data on disks smaller than the size of a breadbox
Reliability
Data in secondary storage is
relatively safe
Convenience
Authorized users can easily and quickly locate data stored on the computer
Economy
Several factors create
significant savings in storage costs
Other Types of storage
RFID (RADIO WAVE)
MAGNETIC STRIPE CARD
SMART CARD
NFC
File Oraganization and Acces Method
Sequential
Data are
stored in particular order according to a key field.
Indexed
Allows records in the data file to be accessed by key value, rather than searching record by record.
Direct
Data can be access directly using a record key.
Optical Disk Storage
Compact Disk
CD-RW
CD-R
CD-ROM
Digital Versatile Disk (DVD)
Magnetic Tape Storage
: Magnetically coated ribbon store large amount of data.
Cloud Storage
: Internet service that provides storage to computer or mobile device users