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What happens during permissions repair in OS X?

One of the commonly recommended maintenance routines in OS X for tackling system slowdowns and other performance problems or odd behavior is to run a "permissions fix" on the boot drive. This is done with Disk Utility, and because it will not hurt the system to perform it is often one of the first suggestions people offer for troubled systems.

Permissions in OS X are file and folder attributes that grant a specific user or group access rights to that file or folder. There are two types of permissions in OS X, the first being traditional UNIX permissions, … Read more

Q&A: MacFixIt Answers

MacFixIt Answers is a feature in which we answer questions e-mailed in by our readers.

This week people wrote in with questions about the PCI Express Expansion Slot Utility not working on some Mac Pro systems, the option to bounce e-mail messages not being present in Mail, how to install OS X Lion on an external hard drive, and an explanation for the "ACLs found but not expected" error in Disk Utility. We welcome alternative approaches and views from readers, so post your own suggestions in the comments!

Question: PCIe expansion slot utility not working MacFixIt reader Frank … Read more