Question

In the following questions and activity, you demonstrate your understanding of the file-system interface and implementation. These are critical features of the way we use computers.

Questions:

1. Some operating systems keep track of the file type, while others leave it up to the user. Which is better and why?
2. In most operating systems, the subdirectories can be read and changed by users, just as ordinary files can be. What is a protection problem that could arise? How can these be dealt with?
3. Explain the advantages and disadvantages of mandatory locks as opposed to advisory locks.

On your computer, make sure file extensions are not hidden. The exact instructions to do this will vary depending on your operating system. Here are some links to directions for turning off hidden file extensions on some of the more popular operating systems:

Microsoft. (n.d.). Show or hide file name extensions, Windows 7. Retrieved from: http://windows.microsoft.com/en-us/windows/show-hide-file-name-extensions#show-hide-file-name-extensions=windows-7

Piltch, A. (2013, August 30). How to Show File Extensions in Windows. Laptop. Retrieved from: http://blog.laptopmag.com/show-file-extensions

Apple. (n.d.). OS X Mountain Lion: Show and hide filename extensions. Retrieved from https://support.apple.com/kb/PH10845?locale=en_US

Linux (generally does not rely on file extensions): http://mylinuxbook.com/file-extensions-in-linux/