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List:       freedos-user
Subject:    Re: [Freedos-user] Accessing usb stick from freedos.
From:       tom ehlert via Freedos-user <freedos-user () lists ! sourceforge ! net>
Date:       2023-07-24 20:13:21
Message-ID: 1572980709.20230724221321 () drivesnapshot ! de
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> > The alleged 4 GB file size doesn't work on some OSes (FreeDOS, Windows
> > NT?), only on old Win9x. So you're only guaranteed 2 GB individual
> > file sizes, universally.
> Wrong. You can use files of up to 4GB size on any Windows version that supports \
> FAT32. So does any reasonable version of Linux. Yes, some OS might limit you to \
> 2GB, as they are using a signed 32bit integer, but that is far from being \
> "universally".

the problem here is probably that early OS versions had checks that the file pointer \
was never moved below zero.

i.e. 
      move to 1.5 GB
      read stuff.
      move to 3.7  GB (which is 2.2 GB which is negative 1.8 GB)
      // what is the OS supposed to do?


the 'solution' was (IIRC) to require applications in the OPEN call to 
indicate "yes, I understand 32 bits"

FreeDOS does this by default.



Tom




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