Re: Largest HD on GS?

[jmk3@crux3.cit.cornell.edu (Jay Krell)]

>   Theoretically, I think there's about a 4GB limit per drive partition, so
>you don't have to really worry about a 600MB drive at all, except for the
>following things. Here's a quick rundown on drives, formatting, and more:
 
>- Prodos and GS/OS volumes have a maximum size of 32MB. Your first volume
 
There is no such thing as a "GS/OS volume".
 
> with later versions of the RamFAST rom, you can have lots (at least 10) of
 
Why the limit? I haven't run ADU in a while, but I remeber it allowing
_many_ partitions.
 
>- There is maybe a 4GB limit on the size of a HFS volume. (I don't know
>the exact details, but that's reasonable).
 
This is interesting. On Macs, the limit is as per _signed_ numbers
and something like 2.5 GB. After that, wierd things happen.
Unsigned is more the norm on the IIGS, so I wonder how the HFS
FST handles it.
 
NOTE: On large, unpartitioned HFS volumes, block allocation is inefficient.
If I remember correctly, HFS uses 16-bit "allocation block" numbers.
So, beyond 32 MB, blocks are used two at a time, after 64 MB 3 at a time.
Eventually, even the smallest file ends up taking a few K on large volumes.

Btw, I think thatis 2.5 GB instead of 2 GB due to hard drive capacities
being K = 1000, MB = 1000000, instead of the "normal" 1024, 1048xxx, etc.

--
  --Jay, jay.krell@cornell.edu