Re: ProDOS' Block Index Question

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

"Rubywand" <rubywand@swbell.net> wrote in message
40327DCC.6F62567C@swbell.net">news:40327DCC.6F62567C@swbell.net...
: "Michael J. Mahon" writes ...
: >
: > Rubywand wrote:
: >
: > <snip>
: >
: > >      According to the ProDOS manual, that's pretty close.
ProDOS uses 4
: > >blocks
: > >(2-5) for the Volume Directory. The first 4 bytes in each
directory block are
: > >used for 2-byte pointers. The first pointer points to the
previous block in
: > >the
: > >directory; the second pointer points to the next block in
the directory. If
: > >there is no previous or next block, the value of the pointer
is 0.
: > >
: > >      39 bytes are used by the directory header. You have
2048 -8 -39 = 2001
: > >bytes to record file entries. Each file entry is 39 bytes.
2001/39 --> space
: > >for 51 file entries in the Volume Directory. This includes
subdirectory
: > >files.
: >
: > This suggests that the Volume Directory might be easily
enlarged beyond
: > 51 files by chaining additional blocks to block 5.  Although
it is possible
: > that the Volume Directory is handled differently than a
subdirectory from
: > the point of view of automatic extension, it seems likely
that directory
: > pointer following would not be special-cased.  Hmmm.
: >
: > -michael
: >
:
: Yep. I did a test using an 800k /RAM5. Added two extra blocks
to the
: Volume Directory (and marked the blocks as allocated in Block
6) and
: was able to store 77 files there before getting the "Volume
Full"
: error.

Could we get a procedure on how this is done?
Thanks.

Bill @ GarberStreet Enterprizez };-)
Web Site - http://garberstreet.netfirms.com
Email - willy4SPAM6pa@comXcast.net
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