If partitioning a drive with Disk Utility gives you unmount or resource busy errors, there may be workarounds you can use.
Normally $36, this handy utility includes a "Windows to go" feature for creating a bootable Windows flash drive.
If you cannot seem to load the OS X Recovery HD partition to use various diagnostics and repair tools, the fix may be quick, but could also require a longer reinstallation.
If you have a specific volume on your Mac that you would like to keep from being edited when attached, here's how to protect it.
Without an intact Recovery HD partition on your Mac, you will not be able to use Apple's FileVault disk encryption feature.
When trying to partition and format various USB hard drives, a number of users are getting errors in Disk Utility that states "Disk Erase failed with the error: POSIX reports: The operation couldn't be completed. Cannot allocate memory".
Partition your hard drive so you won't need to back up media if you need to reinstall your OS later.
Apple's Disk Utility has always checked the health of volume structures, but in Lion it will verify the structure of the partition tables as well.
Apple's Disk Utility by default will only show you user-accessible drive partitions, but here is how to view all drive partitions in Apple's disk management utility.
If your Recovery HD partition in OS X Lion is missing or not working, then it may be easy to get working with just a few steps.