🚀 go-pugleaf

>>Hi, I was wondering if anyone has C code for fast file writing to floppies.
>>The application that I'm writing compresses the data before writing to disk,
>>but the bottleneck is the floppy.  I'm currently trying to optimize disk
>>writing by using a technique similar to XCOPY, but if I had code that
>>resembled XCOPY already written that might help me meet my deadline.
                                                  
>>email: famus2@dmi.usherb.ca                      
                                                    
>Sorry, XCOPY gets its speed from cashing. The basic idea is that copy
>will read a sector and then write a sector( or is that a few sectors).
>Anyway it takes a lot of time to move from the read postion to the
>write position, back to read the next sector and move to write it ....

>Xcopy will read in one or more files at once, the theror being that one  
>sector in a file tends to follow the other, then write them all out at
>once.        
             
>If you want to play at the BIOS level (don't do this at home kids) you 
>can read/ write entire tracks at once. 

Yeah, I know about taking it a track at a time, it's a little too
involved for my timeframe.

XCOPY gains speed (IMO) from batching together READS (until buffer is
full) and writes (until buffer is empty).  Caching is not quite
what XCOPY is doing.  I have not disassembled it (no good disasm).

An interesting idea I received from bobk@bridge2.NSD.3Com.COM
(Bob Konigsberg) is to open, seek til end -1, then write last byte
then seek to beginning, then to write whole file out.  I thought
the idea was so interesting that I posted it for all to see.

Thanks Bob!

Steven Woolgar
CHUS-FAMUS
e-mail: famus2@dmi.usherb.ca