There are two main types. The external
hard drive or a USB Flash Card, also known as a Flash Stick or
Memory Stick.
USB hard drives.
These are external housing boxes
used to accommodate either the hard drives found in desktops or
the much smaller hard drives found in laptops. Personally I
prefer the small 2.5 inch laptop drives as they are more
portable. These are connected to your PC via a USB cable and
the laptop hard drive enclosures do not need a separate power
supply. Their storage capacity is only limited by your budget.
This medium is VERY useful for backups.
USB memory sticks.
These are lipstick sized 'sticks'
that can fit in your pocket or on your key ring. Typically
storage capacities are 2, 4 and 8gigs. 16, 32 and 64gig
sizes are now appearing. Prices are high for the top end
devices and the dollar per megabyte ratio is much higher than
the USB hard drive option.
These are excellent for files that need constant transferring,
eg; reports, accounting data, homework, projects etc.

This is a list of very useful programs
I use and can thoroughly recommend. I believe they can even
be considered ESSENTIAL.
And they are all FREE.
After you download these, make sure you
regularly visit the relevant sites to check for updates.
MalwareBytes Anti-Malware
Anti-adware & spyware protection,
all rolled into one. Searches
for intrusive, malicious programs. The free version is
reactive, not proactive. It must be manually updated and scans
must be manually initiated.
AVG
Anti-virus and anti-spyware protection.
Automatically updates itself. Has full email scanning.
Has the added benefit of not being anywhere near as resource hungry
as Norton's, McAfee or TrendMirco products.
Sunbelt Personal Firewall
Internet 'traffic control'
program. All access paths to and from your computer are
listened to and you are prompted to Allow or Deny each new
access. The program remembers your responses and, over time, it
gives less and less alerts as rules are created.
CleanUp!
A handy and quick program that
removes temporary files, cookies, empties the recycle bin and
generally free up disk space.
Defraggler
Simple. little program that seems to do a better job then the
supplied Windows version. More controllable as well.
Good way to keep your hard drive compact and responsive.
CCleaner
Another great little program by the
makers of Defraggler that goes through your system looking for files
that you don't need to have. Similar to the Cleanup! program.
Also customisable in what extra folders/files you can include in
your searches.
Can also edit the Startup program list
and do a fix of Registry errors.
