🚀 go-pugleaf

In article <1992Oct31.165950.8553@netcom.com> (comp.sys.mac.apps),
leonardr@netcom.com (Leonard Rosenthol) writes:
> In article <1992Oct31.090157.1@tesla.njit.edu> erh0362@tesla.njit.edu
(Elliotte Rusty Harold) writes:
> >> Yes, I once used DiskDoubler on my friend's Mac, and now I
> >> use More Disk Space, from ALYSIS Software.
> >> 
> >> In my opinion, More Disk Space works well because:
> >> 
> >>     1) With most compression utilities, compressed files
> >>       (both applications and documents) must be decompressed
> >>        when opened and accessed. This will make HD full of
> >>        fragmentation.
> >
> >	Autodoubler decompresses into RAM so this is not an issue for
it.
> >
> 	MDS and AutoDoubler will only decompress APPLICATIONS into RAM
- MDS
> because most documents are data based not resource based (which
is how MDS
> accomplishes it's "to memory" tricks) and AD because documents are
opened 
> read/write which implies to them to decompress to disk (since that
means it
> can be modified).

Leonard, this is incorrect as far as AutoDoubler is concerned.  AD
1.0.x and 2.0 can decompress documents directly into memory.  In AD
1.0.x this was done on documents NOT explicitly opened for a read/write
permission.  In version 2.0, most documents are decompressed directly
into memory WITHOUT explicit expansion on disk regardless of the permission
used to open the document.  This can be a tremendous time saver depending
on how much data is initially read by the program in question before
returning control to the user.

Also, I know you have been asking privately about self-modifying applications
compressed with AD 2.0.  By default, AD 2.0 will let any compressed
application modify itself without the problems which occurred with
version 1.0.x, where AD forced applications to be opened in a read-only
state (which was perfectly valid, by the way).  This is done WITHOUT
expanding the application on disk and I'm not referring to the AD
Internal Compressor here.  AD 2.0 has a small list of applications
which we DO open read-only because doing so is a little faster and,
to the best of our knowledge, these few application do not modify
themselves (we use them everyday, that's why they're on the list).

What we're talking about here are the internal workings or our respective
programs and in all honestly I think we are the most qualified to
discuss how AD works internally, NOT Aladdin.  I make no presumptions
(publicly) about how SpaceSaver does its thing, although I'm fairly
certain both from our experimentation and from talking to you.  I
would appreciate it if you commented only on what is public knowledge
about our product when discussing it without making assumptions about
it's internal methodology.  Thank you.

Dave Heller
AutoDoubler co-author
Fifth Generation Systems 

for all FGS products FIFTHGEN@aol.com
for AutoDoubler & DiskDoubler techsupport@salient.com