Re: Copying Mac MFS disks on an Apple II

["Bill Garber" <willy46pa@comcast.net>]

"Charlie" <charlied@NOSPAMbboard.com> wrote in message
bj5u080m41@enews3.newsguy.com">news:bj5u080m41@enews3.newsguy.com...
>
> "Greg Buchner" <apple22@mn.rr.com> wrote in message
> apple22-A39589.22123102092003@apollo-ge0.rdc-kc.rr.com">news:apple22-A39589.22123102092003@apollo-ge0.rdc-kc.rr.com...
> > In article <acdalv4olv4h1ajrgdhr0njafd5gv2tum6@4ax.com>,
> >  Jeff Blakeney <CUTjblakeney@syndicomm.com> wrote:
> >
> > > On Tue, 02 Sep 2003 13:01:00 GMT, "M. Pender" <mpender@hotmail.com>
> > > wrote:
> > >
> > > >IIRC Mac HFS disk blocks are not the same size as ProDos disk blocks;
> there
> > > >are a few extra bytes thrown.  I doubt that the 512 byte ProDos
blocks
> will
> > > >be very appealing to the Mac.
> > >
> > > ProDOS and HFS both used fixed block sizes of 512 byte blocks.  HFS+
> > > supports variable block sizes but I'm almost positive the smallest
> > > size they can be is 512 bytes and they must contain a number of bytes
> > > that is a power of 2 (ie. 512, 1024, 2048).
> >
> > (I hope I've got all of this right...)
> >
> > Actually it's slightly more complicated.  You have to deal with physical
> > blocks (the actual blocks on the hard drive, which are almost always 512
> > bytes) and logical blocks, which can vary in multiples of 512 bytes
> > (unless the phsysical blocks on the HD are different).
> >
> > ProDOS supports only 512 byte logical blocks so they map 1:1 to the HD,
> > 65536 blocks to the volume.
> >
>
> One minor quibble:
>
> I believe ProDOS supports 65535 blocks to the volume, not 65536.
>
> Charlie

No charlie, 65536=0 thru 65535=32,768k=32mb

Bill @ GarberStreet Enterprizez };-)
Web Site - http://garberstreet.netfirms.com
Email - willy46pa@comcast.net



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