Bug killer!
ruff explanation
RAID0 pair up hard drives and are able to run at double speeds you can pair 2,3,4... more drives more speed, but if one drive crashes you lose the data on ALL drives.
2 50 Gig drives show as 1 100Gig
RAID1 pair up drives so they make exact copies of each other, if one drive crashes you still have all your info, and can rebiuld/replace the crashed drive
2 50 Gig drives show as 1 50 Gig
RAId 1+0 is a combination of the above 2, needs 4 drives. the firt pair is raid 0 for speed, and the second pair will backup the 1st.
4 50 Gig drives show as 1 100Gig
RAID 5 is for speed and reliability, ussually 3 drives. writes half data on 1st 2 drives and uses 3rd drive for pairity (allows you to rebuild/replace any of the drives if damaged) some systems uses rotational parity, it works same, but data and parity rotates across all 3 drives.
3 50 Gig drives show as 1 100Gig
RAID 5 is best for speed and reliability, but some space is waisted in order to give fault protection.