home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!news.tek.com!ogicse!decwrl!csus.edu!netcom.com!pdh
- From: pdh@netcom.com (Phil Howard )
- Newsgroups: comp.os.msdos.programmer
- Subject: Estimating MS-DOS file system usage on floppy (3.5HD)
- Message-ID: <1992Nov10.195935.5778@netcom.com>
- Date: 10 Nov 92 19:59:35 GMT
- Article-I.D.: netcom.1992Nov10.195935.5778
- Organization: Netcom - Online Communication Services (408 241-9760 guest)
- Lines: 32
-
- Does anyone know a formula for calculating the usage of files and directories
- on MS-DOS formatted floppy disks?
-
- 1. Of course there is the blocking factor (512) that a file size needs to
- be rounded up to.
-
- 2. The directory entry for a file costs how much per file? Are these
- directory entries blocked at 512 also? Any other overhead?
-
- 3. A subdirectory entries counted the same way as root directory entries?
-
- 4. What about the overhead of pointing to the data blocks in the file?
- Are there any pointer and/or mapping blocks that need to be taken into
- account?
-
- 5. Anything else?
-
- I am writing a bin packing program to do grouped ftp/fsp downloads from
- unix with MS-DOS floppies (specifically 3.5HD) as the target. Everything
- will be in binary so the CR/LF expansion is not a problem (I know what I
- need to do to deal with it if it ever does).
-
- As the "bins" (floppies) are logically packed by the logic, I would need
- to as closely as possible estimate the disk usage. I am assuming empty
- non-system disks.
-
- Thanks.
- --
- /***********************************************************************\
- | Phil Howard --- KA9WGN --- pdh@netcom.com | "The problem with |
- | depending on government is that you cannot depend on it" - Tony Brown |
- \***********************************************************************/
-