I use a mac and have a zip file that contains a base set of files that I use over and over. Every time I need the set of files for a new project, I simply unzip the zip file and they are ready for use. I have unzipped the same zip file over and over again. I have never received an error or corruption alert, but am wondering if unzipping the same zip file repeatedly will cause any data corruption. Thanks!
It's unlikely that the act of unzipping a file will cause any kind of corruption since decompression is a read-only process. However, there is a small chance that repeated access to the file over long periods could cause the disk sectors on which it resides to become corrupted, since it is a magnetic medium and is subject to wear. To mitigate that risk, you can periodically copy the file to another storage device, delete it on the original disk, and copy it back to the original disk. This will (most likely) result in the file being written on different sectors.
No, it shouldn't - providing the file doesn't get corrupted in any other way (e.g. filesystem damage).
Related: Can zipping a file break it?
No, it would not, because "Compression software works by using mathematical equations to scan file data and look for repeating patterns. The software then replaces these repeating patterns with smaller pieces of data, or code, that take up less room. Once the compression software has identified a repeating pattern, it replaces that pattern with a smaller code that also shows the locations of the pattern. For example, in a picture, compression software replaces every instance of the color red with a code for red that also indicates everywhere in the picture red occurs." - http://smallbusiness.chron.com/file-compression-decompression-930.html
For decompression, the computer just calculate again an write a temporary file in your Temp folder as in Windows. Therefore the original file is Read Only in this process. But when you put something or take out something from the archive, it can also be done with modern archive managers, like: 7-zip... In this case, you may corrupt a file.
The other chances are: that you experienced a hard-drive damage, sometimes the system used some space in the file to write other files that causes the problem; Or you experienced a virus attack;
It is always an advise for you to backup your files!