file access - win98 to XP
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file access - win98 to XP
30-03-2008 6:53 PM
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The program works OK and is writing to the working directory, but when it comes to the Backup it says that the Hard disc is full 18.7 GB free out of 37.2 GB. I am not in trouble because I am writing to a USB Pen, no trouble. Just curious, has the Old Win program reached the Win file size limit?. I.E it is trying to write to location over 18 GB?
Re: file access - win98 to XP
30-03-2008 8:38 PM
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It may just be the way the program is misreading the available space on the drive. When programs are written, they are not usually "future proof" - think millennium bug - and the programmer may have hard coded a size limit into the program and the "free space" reading from the drive is "over flowing".
Think about an 8bit binary word, the largest number you can store is 256 and if you try to put 258 into it, you end up with 2 in there instead. This may be what is happening, obviously on a larger scale when the program is reading the space remaining on the disk/USB and thinks there is nothing left, I've encountered a few older programs myself that have the same problem.
This may sound stupid, but copy a folder on to the drive, with say 1 or 2GB of files in it, see if the program can now save to the disk (USB pen). Sometimes you have to try different amounts of "packing" on a disk to fool the program into thinking there is still space there.
Re: file access - win98 to XP
30-03-2008 8:55 PM
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Re: file access - win98 to XP
30-03-2008 9:19 PM
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Usually, the only way to fix this sort of thing is either to remove some files from the drive, or, as I've already mentioned and counter intuitively to add files to the drive so that the program "sees" more free space.
Otherwise, you may need to find another program to do the task, if that's viable.
Re: file access - win98 to XP
30-03-2008 9:53 PM
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Re: file access - win98 to XP
30-03-2008 9:57 PM
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Re: file access - win98 to XP
30-03-2008 10:51 PM
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Re: file access - win98 to XP
30-03-2008 10:57 PM
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It's just that if it's NTFS the program may not cope with it properly for all functions as it was presumably written for a FAT environment with (probably) no knowledge of NTFS
Re: file access - win98 to XP
30-03-2008 11:02 PM
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Re: file access - win98 to XP
31-03-2008 8:45 PM
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Quote from: HPsauce It's just that if it's NTFS the program may not cope with it properly for all functions as it was presumably written for a FAT environment with (probably) no knowledge of NTFS
You wouldn't normally write an application to suit a particular file system, you should leave that kind of thing to the operating system. Unless you are going to do something clever at sector or cluster level, such as a defragmenting program, you would normally just use system calls to load and save files.
The reason being that when you get down as far as the file system level there are differences between USB flash memory, hard disk, floppy disk etc. Any program should only really work with files - leave the operating system and drivers worry about things like the file system and the physical device. When a program is coded in this way, it makes little difference - FAT, FAT32, NTFS, ext2 and so on.
But, as pierre_pierre mentions - it's only curiosity anyway.
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