raid

RAID 0
-block strip - > laju (write)

RAID 1
- mirror

RAID 5
- block strip -> laju(write)
- satu harddisk rosak, still boleh recover

RAID 10
 - kombinasi RAID 1 dan RAID 0

ref:  http://www.thegeekstuff.com/2010/08/raid-levels-tutorial/