Disk Utility (Yosemite): See detailed information about a disk
You can see detailed information about a disk or partition on your Mac, for example:
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Format being used
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Total capacity
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Amount of space available
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Number of folders and files the disk contains
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Self-Monitoring Analysis and Reporting Technology (S.M.A.R.T.) status, which is the disk’s general working condition
Logical Volume Group disk
When you create a logical volume partition from a logical volume group using diskutil, the Available and Used report information in Disk Utility is determined by the storage space used by the logical volume partition you created. For example, if you create a logical volume partition of 400 GB from a logical volume group of 1 TB, the 400 GB storage space used to create the logical volume partition is reported in Disk Utility as Used space, and the remaining 600 GB is reported as Available space for the logical volume group. When you select the 400 GB logical volume partition, the information reported for available and used is determined by the amount of files and folders on the logical volume partition.
Select a disk or partition, then click Info in the toolbar.