Re-Compress Entries

This feature is only enabled for ShrinkIt archives, because disk images don't have compressed entries and Binary II archives are always opened read-only in CiderPress.

Use this function to change the way files and archived disk images are compressed.  ShrinkIt archives created with ProDOS 8 ShrinkIt or the original NuLib are compressed with "dynamic LZW/1", while archives created with GS/ShrinkIt or NuLib2 are compressed with the slightly enhanced "dynamic LZW/2".  You may want to use the gzip "deflate" algorithm to reduce the size of the files even further.

Be aware that not all compression formats can be unpacked with all software.  The best overall choice is "dynamic LZW/2".  If the files will only ever be opened with CiderPress or NuLib2, you may want to use "deflate".  See the Compression Algorithms page for more information about the algorithms and application compatibility.

Each fork of each file is expanded and re-compressed individually.  The files are read in batches, compressed, and written back out.  If you cancel the process, entries that have previously been written out will remain in their re-compressed state.

At the end of the process a dialog appears showing the size before and after of the files in the archive.