Early Thursday, Apple released Performance Update 1.0, a firmware fix for Macs experiencing occasional hard drive stalls under the Mac OS X 10.5 and Mac OS X 10.6 operating systems.

The patch, a 300 kilobyte download available via Software Update, affects the following machines:

- MacBook Air (Mid 2009)
- MacBook Pro (17-inch, Mid 2009)
- MacBook Pro (13-inch, Mid 2009)
- MacBook Pro (15-inch, Mid 2009)
- MacBook Pro (15-inch, 2.53GHz, Mid 2009)
- iMac (20-inch, Mid 2009)
- MacBook Pro (17-inch, Early 2009)
- MacBook (13-inch, Early 2009), MacBook (13-inch, Mid 2009)
- MacBook (13-inch, Aluminum, Late 2008)
- MacBook Air (Late 2008)
- MacBook Pro (15-inch, Late 2008)
- iMac (24-inch, Early 2009)
- iMac (20-inch, Early 2009)
- Mac mini (Early 2009)

The update requires Mac OS X 10.5 or Mac OS X 10.6.1 (for the Snow Leopard version) to install and run.

If you’ve tried the update, please let us know how it worked in the comments.