MenuMeters (for Windows)

Found a nice program, a free one, called DriveGLEAM, that sort of adds the same functionality that MenuMeters has on Os X.

* Monitor physical disks or partitions (or both)
* Allows for CPU, RAM , VRAM usage display in tray.
* Read / Write / ReadWrite and Idle status indicators
* Indicators in tray or the parallel port, output directly to LED's, Just place some LED's on top of your monitor and enjoy real monitoring of read/write status realtime ;) (no special hardware required)
* Keyboard scroll lock LED option.
* Uses very few resources (including cpu usage)
* Very stable.
* Does not "hook" into your system
* Standalone, does not require a install but uses ini setup for your convenience.
* Failure in DriveGLEAM can't "freeze" your drives.
* Configurable start with os delay
* Configurable poll rate
* Does not install lots of files in your system.

It doesn't look as cool & spiffy as the Apple one, but it is as handy.