Tunes - Tuneflow

Mac only: If you're quickly running out of space on your hard drive (or backup drive), free-for-today preference pane Squeeze lowers the footprint of large files by compressing any folder—without requiring anything fancy to read it again.

Windows only: Free utility Disk Space Fan analyzes your hard drive usage to help you determine what's taking up space on your hard drive, representing it all with fancy visualization eye candy.

Windows: Backing up just your data is better than no backup at all, but creating a complete disk image allows you to restore not just your data but your entire operating system and all your settings. SelfImage can help.

If you bought a MacBook sometime between 2006 and 2007, your gear could be eligible for a free hard drive replacement courtesy of Apple. Apparently certain MacBooks of that generation shipped with defective drives—hence the free replacement thing. The program runs until August 15th or three years after you bought your MacBook (whichever lasts longer).

A Windows Home Server is a great way to back up the computers in your home, but don't neglect to back up your server periodically to have a backup that isn't subject to lightning strikes or house fires.

Windows/Mac: Unfortunately the iPhone and iPod touch lack the ability older iPods had to run in Disk Mode. That's where iPhone Explorer steps in, allowing you manually manage files on your device, or just use it as a flash drive, without jailbreaking.

Windows: If you like your software open-source you'll definitely want to check out UltraDefrag a snappy open-source Windows disk defragmenter.UltraDefrag is available as a portable application and in a GUI and ultra lightweight command-line only version—the lightweight version is designated as "micro" in the download list and is at the top of the screen, make sure to scroll down for the GUI version if you want to interact with the program like in the screenshot above.

According to the newest benchmarks provided by Linux-focused web site Phoronix, the EXT4 filesystem for Linux has gained some improvements as far as data loss goes with the latest Linux kernel—but at a cost of a significant drop-off in performance.