On Jan 29, 2023, at 9:37 PM, Zane Healy via cctalk <[email protected]> wrote: > > Some of the floppies I’m recovering data look to be either a multi-part ZIP > file, or something. Was this a separate product from PKZIP? I’m not sure if > I have a copy of PKZIP in the stuff I’ve recovered thus far. I’ve not pulled > them into DOSBOX to try and restore them, so far I’ve just tried to use > Stuffit-Expander. Part of the problem is every file has the same name, just > on different floppies.
Info-ZIP still supports "split" archives, and spanned archives can be converted to split archives by renaming them to the appropriate extension. From the man page: zip version 3.0 and later can create split archives. A split archive is a standard zip archive split over multiple files. (Note that split archives are not just archives split in to pieces, as the offsets of entries are now based on the start of each split. Concatenating the pieces together will invalidate these offsets, but unzip can usually deal with it. zip will usually refuse to process such a spliced archive unless the -FF fix option is used to fix the offsets.) One use of split archives is storing a large archive on multiple removable media. For a split archive with 20 split files the files are typically named (replace ARCHIVE with the name of your archive) ARCHIVE.z01, ARCHIVE.z02, ..., ARCHIVE.z19, ARCHIVE.zip. Note that the last file is the .zip file. In contrast, spanned archives are the original multi-disk archive generally requiring floppy disks and using volume labels to store disk numbers. zip supports split archives but not spanned archives, though a procedure exists for converting split archives of the right size to spanned archives. The reverse is also true, where each file of a spanned archive can be copied in order to files with the above names to create a split archive. A split archive with missing split files can be fixed using -F if you have the last split of the archive (the .zip file). If this file is missing, you must use -FF to fix the archive, which will prompt you for the splits you have. David.
