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2. DriveSpace - Wikipedia

   en.wikipedia.org/wiki/DriveSpace

   The fact that the compressed contents of a compressed drive was stored in a single file implied the possibility of a user accidentally deleting all of their data by deleting just that file. This could happen if the user inadvertently got access to the host drive, containing this file.

3. Disk compression - Wikipedia

   en.wikipedia.org/wiki/Disk_compression

   A disk compression software utility increases the amount of information that can be stored on a hard disk drive of given size. Unlike a file compression utility, which compresses only specified files—and which requires the user to designate the files to be compressed—an on-the-fly disk compression utility works automatically through resident software without the user needing to be aware of ...

4. ALZip - Wikipedia

   en.wikipedia.org/wiki/ALZip

   Basically, it shows a much better compression rate than the Deflate algorithm used in the ZIP format, and even showed a compression rate comparable to or better than the LZMA algorithm of 7zip, which is known to have the strongest compression rate. You can experiment by changing the extension of the file to .com and compressing it in egg format.

5. Disk Cleanup - Wikipedia

   en.wikipedia.org/wiki/Disk_Cleanup

   This option provides a systematic compression scheme. Infrequently accessed files are compressed to free up disk space while leaving the frequently used files uncompressed for faster read/write access times. If after file compression, a user wishes to access a compressed file, the access times may be increased and vary from system to system.

6. List of archive formats - Wikipedia

   en.wikipedia.org/wiki/List_of_archive_formats

   This means that compressed archives with the UC2 file extension can hold almost 1 million files. .uca PerfectCompress [17] Windows: Windows: No Based on PAQ, RZM, CSC, CCM, and 7zip. The format consists of a PAQ, RZM, CSC, or CCM compressed file and a manifest with compression settings stored in a 7z archive. .uha UHarc DOS/Windows: DOS/Windows ...

7. Microsoft Drive Optimizer - Wikipedia

   en.wikipedia.org/wiki/Microsoft_Drive_Optimizer

   Making files contiguous so that they can be read without unnecessary seeking. In Windows 2000 and later operating systems, Microsoft Drive Optimizer has the following limitations: It does not defragment files residing in the Recycle Bin or files that are in use. [7] In particular, this includes the registry, page file and hibernation file.

8. 7-Zip - Wikipedia

   en.wikipedia.org/wiki/7-Zip

   The file manager, by default, displays hidden files because it does not follow Windows Explorer's policies. The tabs show name, modification time, original and compressed sizes, attributes, and comments (4DOS descript.ion format). When going up one directory on the root, all drives, removable or internal appear.

9. lzip - Wikipedia

   en.wikipedia.org/wiki/Lzip

   For example, if the underlying file is a tar archive, this can allow extracting any undamaged files, even if other parts of the archive are damaged. As for the file format, special emphasis has been put on enabling integrity checks by means of an integrated 32-bit checksum for each compressed stream; [ 3 ] this is used in combination with the ...