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:pencil2:1.2 Data Storage :pen: (Storage Units (Gigabyte (GB (1024 MG)),…
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1.2 Data Storage
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SSD
An SSD drive uses direct access to data/a file
There would be no deterioration in read times as there is no physical read-head move
Storage Units
Gigabyte
GB
1024 MG
Terabyte
TB
1024 GB
Megabyte
MB
1024 KB
Petabyte
PB
1024 TB
Kilobyte
KB
1024 bytes
Exabyte
EB
1024 PB
Byte/octet
B
8 bits
Zettabyte
ZB
1024 EB
Nibble
-
4 bits
Yottabytte
YB
1024 ZB
Bit
B
Binary digit, single 1 or 0
Defragmentation
Data is not stored on the medium in one continuous block, files are fragmented(split up and stored on different parts of the disk).
This process is when file fragments are reorganised to make accessing them more efficient.
This also speeds up how fast the computer runs.
Backup Methods
A generation file backup system
This involves storage of three of the most recent versions of the master file
Useful if one version is corrupted: the previous version(s) is still available
Data should be stored off site in case of disaster
Incremental backup
Only backs up data that has changed and writes over older back ups
Useful as it saves storage space and is faster than full backup
Only allows the user to restore the most recent backup