Re: Bad Metric ... 1k = 1024 or 1000?

[phoenyx <phoenyx@texas.net>]

David Empson wrote:

> phoenyx <phoenyx@texas.net> wrote:
>
> >     On my KEGS/Linux system I have a HFS partition setup as 128k which
> > works well. Block size is 1k. For 512k (same as 3.5" HFS floppy) you have
> > to keep the partition under 96 megs.
>
> Firstly, I think you meant 128 MB instead of "128k", and 512 bytes, not
> "512k".
>
> Secondly, to get allocation blocks as small as 512 bytes, you would have
> to limit an HFS partition to under 32 MB.
>
> HFS has a maximum of 65535 allocation blocks per volume, and 512 x 65535
> is just under 32MB (as we well know from ProDOS).
>
> 1 KB allocation blocks would limit you to 64 MB.
>
> 1.5 KB allocation blocks gives you up to 96 MB.
>
> 2 KB allocation blocks gives you up to 128 MB.
>
> By comparison, HFS Plus (supported by Mac OS 8.1 and later) uses a
> 32-bit allocation block number, so it can have much smaller allocation
> blocks on large volumes.  The default allocation block size is 4 KB
> (matching the virtual memory scheme), so HFS Plus wastes less space than
> HFS for any volume size over 256 MB.
>
> [This discussion is getting rather off-topic.  Sorry folks.]
>
> --
> David Empson
> dempson@actrix.gen.nz
> Snail mail: P O Box 27-103, Wellington, New Zealand

yeah, you're right, got my P's and Q's crossed. :-)

Hope you IIgs / HFS users are using the patched HFS driver.

Phoenyx