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- ; v 1.0
-
-
- PACK -- Disk Packing Utility
-
-
- I Introduction
- U Usage
- M Messages
-
- :I
- Introduction
-
- PACK reorganises CP/M disks to improve file access times. It requires
- ZCPR3 with CP/M 2.2 or ZRDOS, and a Z80 or compatible processor. It
- will only run if the user has wheel priviledge.
-
- The data on a given disk is rearranged in situ so that all the data
- associated with each file is contiguous. This reduces disk head
- movement when that file is subsequently read or modified. The user can
- specify certain files which should not be moved, and can specify
- priorities among the remaining files, so that the most frequently
- accessed files are moved close to the disk directory for reduced access
- time.
-
- :U
- Using PACK
-
- Follow these steps -
-
- 1. Make a list of fixed and priority files
- 2. Backup the disk
- 3. Sort the directory
- 4. Run PACK
-
- The file list
-
- PACK requires an input file which specifies which files on the disk must
- remain where they are and which of the remaining files should be moved
- to the beginning of the disk. The structure of this file is a sequence
- of file names and file classes, one to a line. File classes (fixed or
- mobile) are specified by a line beginning with a semi-colon. So a
- typical file list might be:
-
- ; Fixed
- *:!!*.*
- *:BADSECT*.*
-
- ; Mobile
- CMD:COMMAND.LBR
- ROOT:*.*
-
- This means that all files in any user area matching !!*.* and BADSECT*.*
- remain fixed (on my system these are PluPerfect DateStamper and
- Backgrounder files, and files which lock out flakey sectors). Then the
- library file containing less frequently used COM files is moved to the
- front, followed by all files in my ROOT directory. PACK automatically
- appends *:*.* to the end of the mobile list, so all remaining files on
- the disk follow on.
-
- Case is not significant in the file list, and blank lines are ignored.
- Directories can be given in DU: or DIR: form. * or ? in the directory
- field means all user numbers. If a disk is specified implicitly or
- explictly it must correspond to the disk specified on the command line
- (see D option below).
-
-
- Backing up the disk
-
- You should do this reqularly, and always before running PACK. Not that
- a disk crash is more probable while running PACK than at other times,
- but it is more certainly catastrophic if it does happen. You will
- definitely have to restore the disk from your backup copy (floppies or
- tape) if the system crashes due to a power failure or inadvertent reset
- while PACK is running.
-
-
- Sorting the directory
-
- Use CLEANDIR or SAP to sort the directory entries on the disk. The file
- list given to PACK preempts directory order, but within each group of
- files which match an entry in the file list directory order determines
- the order in which the data is packed.
-
-
- Running PACK
-
- Enter the command: PACK <flist> <options>
-
- <flist> is required and is the name of the file containing the list of
- fixed and mobile file patterns. The possible options are:
-
- Dx - pack disk x (default is the disk on which flist resides)
- S - display statistics only. No packing takes place.
- V - be verbose. The file patterns extracted from <flist> are
- displayed, and then the group permutation table (mainly
- for debugging).
-
- Examples:
-
- B>PACK FLIST.C DCS - display number of allocation groups that
- would have to be read and written to
- pack disk C according to the file list
- FLIST.C
- B>PACK FLIST.C DC - as before, but 'for real'
-
- PACK will ask for confirmation before proceeding to pack the disk. The
- process takes anywhere from a few seconds to maybe half an hour
- depending on how much data must be moved and how fast your disk hardware
- is. If you get impatient, on no account switch off or reset the
- machine. If you hit ^C the program will attempt to cut short the
- packing process, but it may take some time to reach a convenient
- consistent state.
-
- :M
- Messages
-
- Normal messages:
-
- Ready to pack disk x
- Are you sure you wish to proceed? (y/n) -
-
- Disk packed
-
- Statistics report:
-
- nnnn group reads and mmmm group writes required to pack disk.
-
- Interrupt:
- PACK: interrupted by user - you pressed ^C
-
- Problems with options:
-
- Option not recognized: x
- No such disk: x
- Disk specification missing
-
- Problems with <flist>
-
- Line xxxx: invalid filename
- Line xxxx specifies disk x (y expected)
- Line xxxx: can't interpret directory specification
- Line xxxx too long: truncated.
-
- Disk read/write errors:
- Can't read directory - disk read error
- read error at group gggg:ss - group cannot be read/written,
- write error at group gggg:ss - see PACK.DOC for recovery
-
- General problems:
-
- PACK requires CP/M 2.2 (or ZRDOS)
- Can't find <flist>
- Disk x is set read only
- Out of memory - you have a tiny TPA
- Disk overflow (can't happen!) - more groups are allocated in
- the directory than there are
- groups on the disk