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- TERRAPIN
- Version 1.30 January, 1989
-
- A large file copy utility by:
-
- George R. Woodside
- 5219 San Feliciano Drive
- Woodland Hills, Ca. 91364 USA
-
-
- TERRAPIN is a file copy utility designed to provide support
- for saving and restoring files which exceed the size of a floppy
- disk.
-
- It accomplishes this task by splitting the large file into
- segments and writing the segments onto multiple floppy disks. The
- segments are not altered or compressed in any manner. They may be
- accessed as normal data on the floppy, although they would only be
- a portion of the original file. Each segment is as large as
- the floppy disk will allow. A secondary file is posted with each
- segment to provide information used in restoring the file. The
- secondary file always bears the name "PART.###" where "###" is a
- sequence number, beginning with 001.
-
- TERRAPIN executes from the GEM Desktop, with a standard menu.
- Under the Desk menu title is the standard "ABOUT" item, which will
- provide a dialog box noting the version of the program.
-
- There are four items under the File title: Save a File,
- Restore a File, File Selector, and Quit.
-
- "Save a File" is the entry used to begin the copying of a
- file to floppy disks. It will offer a file selector box to
- identify the file to be saved. Once that selection is made, a
- dialog box will be presented for selection of a floppy disk drive.
- Select either drive A or drive B to start copying a file, or Quit
- to return to the main menu. This process is repeated until either
- the file has been fully copied, or Quit is selected.
-
- "Restore a File" is the companion procedure. It will offer a
- file selector, initially from floppy disk A. Select the file to be
- restored (you should be selecting it from the floppy disk
- containing part one of the file). Select the file name which
- corresponds to the name under which it was saved, do not select
- the file named "PART.001". A second file selector will be
- presented to select the drive, and file name, for the output file.
- The default for the output is the same file name as the input.
- Once the name has been selected, file restoring will begin. As
- each disk is read, and the file restored, a dialog box will be
- displayed to indicate which drive to read for the next segment of
- the file being restored. When the file has been completely
- restored, the file's date and time stamp will be set to the same
- value as the original copy of the file.
-
- "File Selector" is an option available to defeat the built in
- file selector. Since the standard GEM File Selector is somewhat
- limited, TERRAPIN contains a more sophisticated one. It offers
- buttons to select drives, posts a title line to indicate exactly
- what file is being selected, remembers exactly where it was when
- it is called next time, and positions itself at that point. If you
- have a replacement file selector built into your system, you may
- prefer to use that one. Doing so, however, will cause the loss of
- the features in TERRAPIN's file selector, particularly the title
- line.
-
- ERRORS
-
- Most anything can go wrong, and probably will, says Murphy.
- He is quite right. TERRAPIN is prepared for most errors. When
- writing disks, it may find that the disk inserted for writing is
- not empty, not formatted, or already contains a partial file which
- will conflict with the one being copied. Available options for
- recovery include changing to a different disk, erasing the
- offending disk, reformatting it, changing to the other disk drive,
- using whatever space is available on the disk, or quitting the
- file copy altogether. These situations occur when a disk is first
- being accessed.
-
- You may change disks in the selected drive, and select this
- option, if you want to continue the file copy on a different disk.
-
- You may have the disk erased (it takes about two seconds) and
- have the file written to it. Erasing a disk is total: every file,
- every folder, and the disk label are all erased, and the output
- file will be the only thing on the disk.
-
- You may have the output disk formatted, it it is unformatted,
- or you wish to change the format of the disk. Options offerred
- include 9 or 10 sectors per track, and 80, 81, or 82 tracks. While
- both 9 and 10 sector formats are reliable, 9 sectors is the ST
- standard. Use of 81 or 82 tracks is not recommended, but may work
- on some disk drives. It is important to note that disks formatted
- with anything other than 9 sectors, and 80 tracks, can not be
- copied in disk-to-disk mode from the ST Desktop.
-
- The next option is to use the disk anyway, exactly as it is.
- This may be desirable if the portion of the file remaining to be
- copied is small enough to fit on a partially filled disk. TERRAPIN
- will copy the portion of the file which will fit on the disk, and
- continue if there is more to be done. The only exception to this
- situation is if the segment number of the file being copied is the
- same as the number of the segment of some other file on the same
- disk. This would result in the destruction of the segment
- information of the previous file, and will not be done.
-
- The last option presented is to change disk drives. Click on
- the button bearing the name of the other disk drive.
-
- The more complex error situation is when a write failure
- occurrs during the copying process. TERRAPIN recovers from this
- situation by acting as if the disk with the write error never
- existed. Change to a different disk, and TERRAPIN will resume the
- file copy, starting at the same place it was when the defective
- disk was first inserted. Discard the disk with the error.
-
- Errors reading the file from the floppy disk during the
- restore function are not recoverable.
-
- TERRAPIN is copyrighted, but released for public distribution.
- TERRAPIN is not to be sold except for nominal charges for media,
- reproduction, and/or connect charges while downloading.
-
- If TERRAPIN gives you any trouble, or you have any suggestions,
- please feel free to contact:
-
- George R. Woodside Compuserve 76537,1342
- 5219 San Feliciano Dr. GEnie G.WOODSIDE
- Woodland Hills, Ca. 91364
-
- USENET: ..!{philabs|csun|psivax}!ttidca!woodside
- or woodside@ttidca
-
-