Date: Fri, 17 Mar 1995 16:32:44 +1000 From: Bruce Evans <bde@zeta.org.au> To: PVinci@ix.netcom.com, phk@ref.tfs.com Cc: hackers@FreeBSD.org Subject: Re: why does WD.C work?? Message-ID: <199503170632.QAA10239@godzilla.zeta.org.au>
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>> What I see, is that the wdparam structure is wrong according to table 12
>> of ATA. eg.
>> word 0 General Config.
>> word 1 # logical Cyl.
>> word 2 reserved
>> word 3 # logical heads.
>> but wdparam looks like:
>>
>> struct wdparams {
>> /* drive info */
>> short wdp_config; /* general configuration */
>> short wdp_fixedcyl; /* number of non-removable
>> Cylinders */
>> short wdp_removcyl; /* number of removable cylinders */
>> short wdp_heads; /* number of heads */
>> short wdp_unfbytespertrk; /* number of unformatted
>> bytes/track */
>The "reserved" field was indeed at one time intended to be used for
>"removable" cylinders...
The padding is OK, but wdp_removcyl is used to calculate d_ncylinders
so it may cause problems if it is nonzero.
Bruce
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