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Storage devices - Coggle Diagram
Storage devices
Difference between Backing storage& RAM
RAM is bulkier than backing storage per unit odf memory
RAM provides faster access than backing storage
RAM is more expensive than backing storage per unit of memory
Software package may be so large that it is physically impossible for RAM to store it
More likely that data is accidentally deleted in RAM
DAta may need to be transferred from one computer to another and can't do that with RAM
If computer is switched off work in RAM goes but backing storage stores data for future use
Magnetic tape
Magnetic storage medium
Transfer data is slow
Type of access= Serial/ Sequential
Very large amounts of data can be stored
Used to backup file servers
Not normally used by home users
Backups
Why backup?
In case it is deleted or changed accidentally
In case of system malfunction
In case files is lost or stolen
In case the file is corrupted
Viruses in backups
Can fill up storage medium making it unusable
Deletes data/change data
Backup can't protect from viruses
Makes software/opersating system usable
Definition of
Kept on an alternative medium away from computer
Kept in case anything happens to the original file
A backup file is a copy file
Backup devices
Magnetic Floppy/Portable Hard disk/Jaz/Zip/Tape
Optical CD/DVD/HD/Blue Ray
Portable Hard Disk
Adv of
Holds large amounts of data
Can access data quicker than floppy
More reliable than floppy disks
Cata can be read from any part of the disk
Data can be read from and written to
Portable storage device
Disadv of
Slows down when running out of disk space
Used to transfer viruses
Fragile-should not be dropped
Information
Very popular backup device
Food n outside of the computer
Size greater than 2 terabyte
Used to store personal files like video/images
Magnetic storage medium
Can access data quicker than floppy
Type of access= Direct/Random
Fixed Hard Disk
Adv of
More reliable than floppy disks
Can access data quicker than floppy/CD/DVD
Data can be read from and written to
DAta can be read from any part of the disk
Holds large amounts of data
Disadv of
Slows down when running out of disk space
Slow transfer rate than Solid state devices
Fragile-should not be dropped
Not portable
Information
Very popular backup device
Found inside of the computer
Size greater than 2 Terabyte
Used to store OS files & personal files
Magnetic storage medium
Most popular storage device
Type of access= Direct/Random