home *** CD-ROM | disk | FTP | other *** search
-
-
-
-
- LOADDSKF & SAVEDSKF User's Guide
-
- (c) Copyright International Business Machines Corporation 1993.
- All rights Reserved.
- 01/27/93
-
- LOADDSKF & SAVEDSKF
- ___________________
-
- INTRODUCTION
- ____________
-
- SaveDskF.exe and LoadDskF.exe are a pair of utilities to
- save a diskette to a file and vice-versa. These programs are
- not intended to save fixed disk images. They have these
- characteristics:
-
- ∙ Run under OS/2 and DOS 3.3 or later.
-
- ∙ Empty sectors above the highest occupied sector are not
- included in the file.
-
- ∙ The data may be compressed.
-
- ∙ Diskettes may be formatted as they are written.
-
- ∙ Standard diskette formats are supported.
-
- ∙ Conversion to a larger diskette image is possible.
-
- ∙ Label text may be included in the file that is displayed
- by LoadDskF before the diskette is written.
-
- ∙ The progress of the data transfer is visible on the
- screen.
-
- ∙ Built-in Checksum function.
-
- ∙ Handles "image" files generated by other programs.
-
- Efficient portability of complete diskette images is pro-
- vided for transmission via data networks. Boot, file allo-
- cation table, directory and data sectors are included. Both
- programs provide a short help facility when some types of
- syntax errors are detected. Just type the program name to
- get help.
-
-
-
-
-
-
- LOADDSKF & SAVEDSKF 1
-
-
- LOADDSKF
- ________
-
- The calling syntax is:
-
- LoadDskF [D:][path]filename.dsk d:[/F][/C][/Y][/Q]
-
- The diskette image contained in the file is written to the
- specified target drive d:. The target diskette must have
- the same format as the original diskette. If the format is
- incorrect, an informational message indicates the required
- format.
-
- A warning message appears before the data transfer begins so
- that syntax errors do not result in a corrupted diskette.
- It is necessary to press the "y" key in order to continue
- the process. A return code of 31 (decimal) is issued if the
- response is not "y". Alternatively, /Y will bypass the need
- to press the "Y" key. When both /Y and /Q are invoked, the
- warning message is omitted.
-
- In the event of a checksum error, both the expected and cal-
- culated values are displayed.
-
- IMAGE FILES
- ___________
-
- Loaddskf supports input files that represent a pure binary
- image of the disk that has been generated by SaveDskf with
- the /D and /A options or other programs, such as DSKIMAGE
- and DISKIMGE. Image is defined as the uncompressed disk
- data without header or trailer. The file must be the exact
- size of a standard diskette. Diskettes supported are 1.44M,
- 1.2M, 720K and 360K.
-
-
- FORMATTING
- __________
-
- When /F is specified, each track is formatted before it is
- written. When all of the data has been written, LoadDskF
- continues to format the remainder of the tracks.
-
-
-
-
-
-
-
-
-
-
-
-
- LOADDSKF & SAVEDSKF 2
-
-
- CONVERTING A DISKETTE
- _____________________
-
- When /C is specified, the diskette image can be written on a
- diskette of a different format than the original diskette
- provided that it is at least as large as the original. The
- resultant diskette's capacity will then appear to have the
- original diskette's capacity. After executing LoadDskF /C,
- it is recommended that the files be transferred to another
- diskette using the DOS copy command. The diskette with the
- truncated capacity can then be reformatted.
-
- When you use the /C option together with the /F option, your
- diskette will be formatted to the highest density supported
- on the drive (not exactly true, but it will be most of the
- time). There is no means for specifying lower capacity me-
- dia. The image written to diskette will be logically the
- same as the source. There are some subtle differences, how-
- ever. Let's assume that we have a 1.2Mb image that we want
- to put onto a 1.44Mb diskette. There are 18 sectors per
- track on a 1.44Mb diskette. There are only 15 on a 1.2Mb
- diskette. In this case we would only write 15 of the 18. The
- boot record would tell us that there were only 15 sectors
- per track. This looks to DOS just as if it were a real 1.2Mb
- diskette. Physically, there are actually 3 sectors on each
- track that are not used. DOS is told they don't exist and it
- never looks for them.
-
- When you tell LoadDskF the /F option, it will format the
- output diskette to the same density as the input diskette
- image (providing, of course, that the diskette drive sup-
- ports that kind of image).
-
- If you ALSO use the /C option, your diskette will be format-
- ted to the highest density that the drive supports. If we
- assume we have a 2.88Mb diskette drive and a 1.2Mb or 1.44Mb
- diskette image, the diskette will be formatted to 2.88Mb.
- The image written to diskette will be either 1.44Mb or
- 1.2Mb. It will PHYSICALLY be formatted as 2.88Mb, but will
- LOGICALLY be a 1.44Mb or 1.2Mb diskette. If you first wrote
- the 1.44Mb image to a diskette and then used ONLY the /C op-
- tion and wrote a 1.2Mb image to the same diskette, it would
- work. If you now try to write a 1.44Mb image to the same
- diskette with only the /C option, it would fail. This is be-
- cause DOS thinks that you have a 1.2Mb diskette in the drive
- and a 1.44Mb diskette won't fit. In this case, you MUST use
- both the /C option and the /F option.
-
- It is important to understand that this is not an all encom-
- passing conversion from 3.5 to 5.25 inch media. In some in-
- stances, 3.5 inch media is provided for PS/2 systems and
- 5.25 inch media for PC systems. Therefore code that supports
- hardware may be different for each media type.
-
- LOADDSKF & SAVEDSKF 3
-
-
- In those cases where the media type is unimportant, a file
- packager such as SaveRam or PKZIP is strongly recommended
- over SaveDskF so that those who receive the packed file need
- not have a particular type of diskette drive.
-
- PROGRESS INDICATION
- ___________________
-
- As the data is written to the diskette, the percentage of
- the data which has been written is displayed on the screen.
- If the diskette is being formatted as it is written, the
- percentage is based on the diskette capacity.
-
- DOS COMPATIBILITY MODE
- ______________________
-
- There is sometimes a problem when operating in the DOS com-
- patibility mode where DOS does not recognize the newly gen-
- erated diskette. When this happens, the diskette appears to
- have incorrect system information and it is necessary to
- partially remove it and re-insert it in the drive.
-
- UP/DOWN LOADING
- _______________
-
- When transferring diskette image files between the PC and a
- host system, it is necessary to treat them as binary files,
- i.e. no translation of data must occur. If the file data
- has been translated, LoadDskF will usually give an error
- message indicating that the file is not compatible with
- LoadDskF.
-
- It is also necessary to download any executable file includ-
- ing LoadDskF.exe and SaveDskF.exe as binary files without
- translation. When translation occurs, the results are un-
- predictable and usually hang the machine requiring a power
- off/on sequence to get back into operation.
-
- LoadDskF will ignore any data at the end of a file that is
- shorter than a complete sector. This provides some
- forgiveness for the common error of uploading to a fixed re-
- cord length file on a host system which results in a mean-
- ingless string of data at the end of the file which is
- usually not longer than 80 bytes.
-
-
-
-
-
-
-
-
-
-
- LOADDSKF & SAVEDSKF 4
-
-
- SAVEDSKF
- ________
-
- The calling syntax is:
-
- SaveDskF d: [D:][path]filename.dsk [/D][/A][/N][/M][/K]
-
- Since the diskette that the file will be copied to by
- LoadDskF must be the identical format as the original, it
- may be helpful to give the file a name that is indicative of
- the required format, or include the diskette type in the
- commentary message (/K or /M flag). An extension of .DSK is
- recommended to indicate a diskette image file.
-
- The complete image of the diskette in drive d: is written to
- the specified file. A file header as described below and
- all diskette sectors are written up to and including the
- highest occupied data sector. Whether or not a data sector
- is in use is determined from the file allocation table. An
- informational message is displayed if some of the sectors
- written do not actually contain data. This means that there
- are some gaps in the data portion of the diskette. An ap-
- propriate response is to run a disk defragmentation program
- against the source diskette. Copy protected diskettes having
- non-standard sector numbers cannot be saved by SaveDskF.
- Only standard DOS formats are supported.
-
- As the data is written to the file, the percentage of the
- data which has been written is displayed on the screen.
-
- PURE DISKETTE IMAGE
- ___________________
-
- The /D option omits the file header and inhibits compression
- of the diskette data. The resulting file is intended for
- use with diskette copying software and is not compatible
- with LoadDskF.exe unless the /A option is also used. When
- /D is specified, /K and /M will generate an error message.
-
- SAVE ENTIRE DISK
- ________________
-
- The /A option saves the whole diskette regardless of the
- data stored on it.
-
-
-
-
-
-
-
-
-
-
- LOADDSKF & SAVEDSKF 5
-
-
- DATA COMPRESSION
- ________________
-
- The /N option inhibits data compression. This is useful
- when the compression algorithm fails and produces data that
- is larger than the uncompressed data. When this happens,
- SaveDskF displays an informational message recommending that
- you rerun the program with /N specified.
-
- COMMENTARY MESSAGE
- __________________
-
- The /M option tells SaveDskF to get text from the specified
- file to be included as a comment in the diskette image file
- which LoadDskF will display before unloading the diskette
- data. It may contain information on any aspect of the
- diskette usage or the way it is to be unloaded. This pro-
- vides a means of ensuring that the recipient of the diskette
- will be aware of important information.
-
- The /K option allows you to type in a brief commentary mes-
- sage on the command line. The text must follow immediately
- and be enclosed in either single or double quotes. The en-
- tire command length is limited to 128 bytes. When enclosed
- in single quotes, double quotes may be used in the text and
- vice versa. If a message file has been specified with /M,
- the /K text is added to its contents. The total length of
- the message may be up to 4096 bytes.
-
- Examples of these flags are:
-
- SaveDskF a: test.dsk /k"This is a 1.44Mb diskette"
- OR
- SaveDskF a: test.dsk /m test.msg
- OR
- SaveDskF a: test.dsk /mtest.msg
-
- Where test.msg might contain:
- +--------------------------+
- + This file could contain +
- + the text that you would +
- + want printed on the label+
- + of the diskette. +
- +--------------------------+
-
-
-
-
-
-
-
-
-
-
- LOADDSKF & SAVEDSKF 6