C
choro
Excuse me but RAID of any variety is asking for trouble, if you ask me.Raid is designed to reduce the odds of data loss.
Raid 0: uses a single disk, makes a copy. If the disk fails, you lose
both copies of the data. I don't know why it even exists, it's useless
as mammary equipment on a male bovine.
Raid 1: requires two physical disks, one is a mirror of the other. If
one fails, the OS simply uses the other one. NB that the whole system is
mirrored, OS data and all. This is the one to use if you have a single
machine.
Raid 2 to 5: other schemes of duplicating data over many disks/machines.
Reasoning: if the odds of disk failure are, say, 1:1,000,000, then the
odds of two disks failing simultaneously are 1: 1,000,000,000,000. (This
is basic probability theory). So if you use two (or more) cheap
(=relatively failure prone) disks instead of one (or a few) expensive
(=failure resistant) disk, you have a better chance of preserving your
data.
So if you automatically write the same data to two disks, you vastly
improve the odds of saving your data. All server farms use variants of
this scheme (plus hot-swappable disks, so that failed hardware can be
replaced without shutting down the system.)
For more, check Wikipedia. Raid = Redundant Array of Inexpensive Disks.
HTH
Wolf K.
The only time RAID can come in useful is if the second HD is a copy of
the first HD. Why not instead clone a copy of your OS and other software
once everything is fully installed (and may be periodic cloning or
backing up to cover yourself for updates) and use xcopy or xxcopy to
copy all your user files to an external 2.5" HD which you just connect
with a USB cable without any resort to mains adaptors etc and which, if
need be, you can pop in your pocket and carry with you?
RAID of all colors is utterly pointless in any case. Just clone your HD
or make a proper back up of it and use the xcopy or xxcopy command to
copy your user files to an external disk drive. Hey, your "external" HD
could even be a 3.5" HD mounted inside a desktop but of course you then
lose the advantage of popping it into your pocket and taking it with
you. You can't have your cake and it it too, you know!
Our motto in life should always be "KIS" or "Keep It Simple"...
-- choro