sybase space calculatio, why must divide / multiply by 512 ?

In sybase why when we need to convert pages into MB or MB into pages it must multiply / divide by 512 ??
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Mark BullockQA EngineerCommented:
I think the size unit must be in 512-byte blocks.

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I think there is a confusion here. Page size is usually calculated as 2K (2048 bytes), sometimes as actual page size configured.
Joe WoodhousePrincipal ConsultantCommented:
On an ASE using a page size of 2Kb, dividing the number of pages by 512 gives the correct size in Mb... since 512 x 2Kb = 1024Kb = 1Mb. There is no version of ASE that has ever used 512 byte page size so the accepted answer is not correct.

Note this is only true on 2Kb page size ASEs. It is also possible to have page sizes of 4Kb, 8Kb or 16Kb, meaning using 512 would result in the wrong space being calculated.

All bets are off for the other Sybase database products.
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