dd curiosity

Adrian Le Hanne alh at einoed.UUCP
Fri Jan 5 23:27:21 AEST 1990

mark at zok.UUCP (Mark W. Snitily) writes:

>For example, if I write 4 sectors into the partition starting at sector

>But, if I read 4 sectors from the partition starting at sector 20000,
>the read will take forever to complete, (i.e. we're talking minutes to
>Anyone have any ideas why reading with dd takes so long?

A write is stored in the buffer cache while a read must access the storage 
directly to get (uncached) data.

>-- Mark

Adrian S. Le Hanne           ..!tmpmbx!einoed!alh                    alh at einoed
Einoed Systemberatung. Joachimstalerstr.19, 1000 Berlin 15. Tel.:030 / 88000335
             "Le plus semblable aux morts meurt le plus 'a regret"

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