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SATA - PATA, "native" - "legacy" (Announce)

posted by tom Homepage, Germany (West), 07.12.2007, 14:58
(edited by tom on 07.12.2007, 15:16)

> > > - My experiments with Rawspeed (I think that it can be interesting)
Rawspeed (edited) is really slow, where ever you use it (e.g. it uses a buffersize of 20K only).

when measuring the I/O interface, you should use the fastest possible program, not the slowest.

> * Idecheck 0 /PIO
>
> 10043 KB/sec ---> 9.807 MB/sec
>
> * Idecheck 0 /I13
>
> 19274 KB/sec ---> 18.822 MB/sec
>
> * Idecheck 0 /DMA
>
> 19308 KB/sec ---> 18.855 MB/sec
so it looks like the BIOS is already using UDMA (and JEMM386 is as good, or as bad as the BIOS)

otoh, all of the above uses DPMI programs.

try rawread for a real mode program if that changes things.

try

RAWREAD 0 (does basically the same as Idecheck 0 /I13)

and (create a big file and)

RAWREAD C:\BIGFILE.DAT

which reads a large file for about 10 seconds.

> My computer is a Pentium III 600 MHz with 256 Mb of RAM
disk age (or disk size) would help as well; old hard disks just weren't faster then ~20 MB/sec

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