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Doubt on sector address of Disks

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Lets #surfaces = 16, #sectors = 64 and size of each sector = 512 B

Given address is <1200,9,40>. This address means _______________________th sector.

ans:

[( 1200*16*64 + 9*64 + 40 ) - 1 ]th sector = 1229415 th sector [ since sector starts from 0 ]

Am I correct?

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