Page 15 - Appendix Final

Datum The first Differential backup, backs-up only those chang-
In grammatical terms, ‘Datum is singular’ and ‘Data, plural’. es made to the original full backup. This is a small back-
Datum is rarely use as ‘Data’ is commonly used as both sin- up. The second Differential Backup, backs-up, ‘again’, all
gular and plural the changes made to the original full backup. This is a
large backup. With the differential backup system each
Delete backup, after the first small Differential backup, grows
In computer terms Delete is a bit of a misnomer. To delete substantially larger as each backup backs-up all the
files and folders from your computer merely renders them changes made to the original full backup. In theory, all
unavailable, and if action is instituted quickly and with spe- previous backups, from the present backup, could be
cialised software, the deleted data is often retrievable. Even- deleted as they’ve all been duplicated by the present
tually when space is needed, the data will be overwritten. backup.
Delete and Cut have similar effects on what you’re looking at Although Differential backups, can get quite large
on the screen. To Cut or, to Delete, removes the data from and need careful management, there ‘Restore’ rate is
the screen; you can no longer see it. The differences are, Cut very fast and less prone to errors.
copies the data to the clipboard, where it can be reused.
With Delete the data is no longer available.
It’s handy to keep in mind, when you are working on
any kind of document and you delete something by mistake,
the document you’re working on is only a screen copy of the
original. If the software has an Undo feature, that can be
used to recover the deleted data. If Undo is unavailable, you
must not save the screen copy. It’s only when you click save
on the screen copy that the changes are implemented in the
original document. Closing the screen copy immediately,
without saving, can often stop these changes taking place on
the original. If the document is set to auto save there’s no
guarantee closing the screen copy will prevent these adjust-
ments. Keep in mind also that screen copy's are not re-
moved from your computer and can remain undeleted on
your computer for a very long time.

Desktop
The first screen you normally see when your computer boots
up. It will have a taskbar, normally at the foot of the screen,
where the Start Menu is located. Click on Start will give you
access to all the installed programs. The desktop has a back-
ground known as “wallpaper”, This wallpaper could be a
favourite family photo or countryside picture. Depending on Digit
the user the Desktop could be cluttered with shortcut Icons, A single character in the numbering system. ‘Decimal = 1
Files, PDF documents and Folders, or with the minimal of through to 9. Binary = 0 & 1
clutter and only the essential Icons like, Recycle bin and This
Pc. The Desktop is also Known as a UI, (User interface) (or
WIMP interface). DIMM (Dual In-line Memory Module)
A printed circuit board that holds memory The ‘Dual’
Dialog means the circuit board is equipped with two channels or
A dialog is a little popup often asking for some sort of confir- signals.
mation or clarification. For instance, if you delete a folder
sending it to the recycle bin a dialog will popup asking ‘Are DIN
you sure you want to send this folder to the Recycle Bin? 5 pin connectors for a keyboards and a mouse. The 6 pin
Another form of Dialog is, if you Save or Save as, a document ‘PS/2 connecter’ first introduced by IBM is more popular
you’re working on, the save dialog will popup allowing you to today. A single dual PS/2 connector for a mouse and a
name the document and decide in what format you want to keyboard can also be found today on some mother-
save the document. boards

Differential Backup DIP (Dual In-line Package)

A Differential backup is the style name of the backups you make A rectangular chip with a line of pins on each side used to
‘AFTER’ you’ve made the first full backup. attach the chip to the motherboard.

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