SUMMARY: HSZ70 miscalculation

From: Gary Menna <G.Menna_at_isu.usyd.edu.au>
Date: Wed, 16 Sep 1998 09:17:38 +1000 (EST)

Hi All ,
Question :
        After partitioning a raidset on a HSZ70 I noticed
        that the size given in 512k blocks does not match
        the size given in the brackets in MB .

Partition number Size Starting Block Used by

 1 6280955 ( 3215.84 MB) 0 D100
 2 10469115 ( 5360.18 MB) 6280960 D101
 3 4186875 ( 2143.68 MB) 16750080 D102
 4 8375035 ( 4288.01 MB) 20936960 D103
 5 8793595 ( 4502.32 MB) 29312000 D104
                    3771795 ( 1931.15 MB) 38105600 <free>

ANSWER :
        After logging a call to Digitals CSS I was told that
        the HSZ70 uses the calculation for the good old
        "Marketing Megabyte" to work out the size in MBs .
        The Marketing MB is blocks x 512 / 1,000,000 .
        This calculation is used in the dxdisk GUI with the
        sliding bars used to partition disks as well .

        ergo : 6280955 / 2048 = 3066 (the actual size of partition 1)

        6280955 x 512 = 3215848960 / 1,000,000 = 3215.84
        is the marketing MB .

        That is why my 4.3 GB disks are only 4090MB
        and my 9 GB disks are only 8676 MB .
        I was also told that my belief that there is 1024 bytes
        to a KB and 1024 KB to a MB is just something that I
        had presumed , and does not necessarily mean its true .


Thanking you ,

Gary Menna E-Mail g.menna_at_isu.usyd.edu.au
Information Technology Services Phone +61 2 9351-6360
University of Sydney (G05) Fax +61 2 9351-7711


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Thanking you ,

Gary Menna E-Mail g.menna_at_isu.usyd.edu.au
Information Technology Services Phone +61 2 9351-6360
University of Sydney (G05) Fax +61 2 9351-7711


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      # #
      # Quidvis Recte Factum, Quamvis Humile, Praeclarum #
      # #
      # R-R #
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Received on Tue Sep 15 1998 - 23:18:37 NZST

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