Re: Problem Copying Files to a ZIP Drive
From: R. C. White (RCWhite_at_msn.com)
Date: 05/11/04
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Date: Tue, 11 May 2004 10:57:25 -0500
Hi, Joe.
The "size on disk" may be much more than that, depending on how the Zip
drive is formatted. Even a 1-byte file will take a full allocation unit
("cluster"), and the size of a cluster depends on the format. If the Zip is
using NTFS with typical 4 KB clusters, 5,000 files would take at least 20
MB, even if every file was less than 4 KB. If they were 1 KB each, for
example, they would total 5 MB, but they would take 20 MB of disk space.
If 5,000 files total 224 MB, the average size is 44.8 KB. An average file
would take a dozen 4 KB clusters, because 11 clusters would not hold the
entire file. Of course, it's not likely that each of your files is the
"average" size. And 5,000 * 12 * 4 KB = 240 MB. In general, a group of
files of random sizes will waste 1/2 cluster per file, so 5,000 files would
waste 10 MB using 4 KB clusters, or 256 MB using 512-byte clusters.
Depending on the sizes of YOUR files, you MAY be able to crowd them all into
250 MB by reformatting your Zip drive.
For a 250 MB HD, WinXP uses a default cluster size of 4 KB when formatting
FAT16, 2 KB for FAT32 and 512 bytes for NTFS. (For details, see this page
in the online version of the Windows XP Pro Resource Kit:
http://www.microsoft.com/resources/documentation/Windows/XP/all/reskit/en-us/Default.asp?url=/resources/documentation/Windows/XP/all/reskit/en-us/prkc_fil_tdrn.asp)
RC
-- R. C. White, CPA San Marcos, TX rc@corridor.net Microsoft Windows MVP "Joe Harman" <harmanj1@comcast.net> wrote in message news:hsSdnUY1XbdF3z3dRVn-vg@comcast.com... > The total files are <224 mb. > > > "Nick Burns" <thedoc@hotmail.com> wrote in message > news:%23cvT1DwNEHA.3816@TK2MSFTNGP12.phx.gbl... >> 5000 will never fit on a 250 meg zip. Just copy less then 250 megs of > data. >> It all depends on the size of each pictures, do you know how big each >> picture is...? If not, find out. >> >> "Joe Harman" <harmanj1@comcast.net> wrote in message >> news:CP6dnQEJIewkrT3dRVn-ig@comcast.com... >> > I tried to copy several (>5000) jpg files from a CD that I had created > to >> a >> > 250 MB Iomega Zip disk. It failed several times so I copied the files >> from >> > the CD to the C:\ drive with no problem. I then attempted to copy the >> files >> > from the C:\ drive to the Zip disk. It copies some of the files then >> halts >> > and displays an "Error Copying FIle or Folder" dialog box with the > message >> > "Cannot Copy filenmxxxx:The Directory or File Cannot Be Created. I >> thought >> > maybe the number of files being copied might have had some effect so I >> > copied only a few but it doesn't seem to matter. >> > >> > Does anyone know what my problem might be? The files can be copied >> > from >> one >> > folder to another within the C:\ and were copied from a CD to the C:\ >> drive. >> > But when I try to copy that same file to the Zip Drive, it fails. It >> seeems >> > to be consistent with particular files.
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