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Question 16/20
Explanation: The question states that you have 5 18GB drives, but one is dedicated as a spare. Therefore, you
have the use of 4 drives which equals 72GB. When using RAID 5, parity data is written across the disks, using
the equivalent of one disk's space (18GB). Therefore, the total useable space is 72 - 18 =
54GB.
Reference: http://www.pc.ibm.com/us/infobrf/raidfin.html
Incorrect Answers
A: The total usable space is 54GB, not 18GB.
B: The total usable space is 54GB, not 34GB.
D: The equivalent of one drive is used for parity. Therefore, the total useable space is 72 - 18 = 54GB, not
72GB.
E: One drive is spare and the equivalent of one drive is used for parity. Therefore, the total useable space is 72 –
18 = 54GB, not 90GB.