parsing hdx=swapdata doesn't do anything

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Hello,

I am trying to byteswap one of my disks. So I parse the next option hdc=swapdata (I also tried hdc=bswap)
During boot I see the following message:
 ide_setup: hdc=bswap

cat  /proc/ide/hdc/settings
bswap                   1              0               1               r
Looks also ok.

But then I do a cp /dev/hdc swappedfile.dat or a dd, but the file is the same as without enabling bswap???
I tried different kernels 2.4.18/7 and 2..2.19 same problem.

Do I need to enable an extra option in the kernel?

Thanks for reading sofar.

Cheers,

      Erik


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