An issue may occur on some Mac systems where after installing the OS X 10.10.3 update, the Finder and other services that report drive space may show an increasing level of available space. This may be accompanied by the Storage tab in the About This Mac window showing your hard drive’s space is being used only for backups.
In general, when this type of oddity appears in the About This Mac window, it suggests your drive’s Spotlight index needs to be rebuilt; however, this issue will likely survive a forced index rebuild. Continue reading
Despite its user-friendly interface, OS X sometimes gives no more information than an error code when something goes wrong. One of these is error code -50, which may occur when you attempt to copy, move, or delete files from external hard drives. If this occurs and you are stuck with a file you cannot manage, then you can likely overcome this error with a few possible approaches. 
Regardless of the number of storage devices you have attached or built into your Mac, you will likely use Disk Utility for formatting them when necessary, to partition and resize them for various purposes, and otherwise managing them. However, one limitation you might find when using Disk Utility is that it will only act on one drive or volume at a time. 
The Spotlight index in OS X is the database used for quickly accessing file information on your Mac. While this is primarily used for finding files on your system, there are several other services that use Spotlight’s information, and if there is any damage to Spotlight then you might see odd problems and behaviors dotted throughout your system. 
Whenever you upgrade a system there will always be times when configuration errors or incompatibilities may prevent specific features from working properly, such as a WiFi connection that is constantly dropping, but at other times more nondescript slowdowns may occur that have you questioning whether or not upgrading was worth it.
Do you have a Mac that is gaining a few years on it and is not performing the same as you remember when you first bought it? While you might not be able to pinpoint it, you might simply notice programs take longer to launch, or you now have to wait a few extra moments for other tasks to complete.