ITEM: AL7753L

Why a 4.5 Gigabyte disk show 3840 Megabytes Total PPs

Question:

NEEDS ASSISTANCE WITH VOLUME GROUPS/TOTAL PPS-IS THIS ACTUAL SIZE
OF DISK?

Response:

ENV:
.AIX 3.2.5
.DESC:
.Customer bought a 4.5Gb disk and wants to know why smit shows it
as 3840 Megabytes in size(3.8Gb).
.    PP SIZE:        4 megabyte(s)
    TOTAL PPs:      960 (3840 megabytes)
.ACTION:
.3840Mb = 3840 * 1024\^2 = 4,026,531,840 bytes = 4.02Gb not 3.8Gb.  As 
for the remaining .48 GB, this is mapped out as bad blocks and for
VGDA/VGSA areas.  Additionally, the manufacturer of the disk may 
actually produces a 4.5 Billion byte disk instead of a 4.5 Gigabyte 
disk.( a difference of 331,838,208 bytes - .33Gb)
.NEXT
.CC



Support Line: Why a 4.5 Gigabyte disk show 3840 Megabytes Total PPs ITEM: AL7753L

Dated: August 1995 Category: N/A

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