Press "Command-Space Bar" to initiate Spotlight, a file search and application launching tool. The "Repair Disk Permissions" button in the "First Aid" tab for each hard drive is an invaluable tool that can often fix issues that might arise on your Mac. In particular, this operation can resolve software stability issues that arise during the installation of new programs on your Mac.
These issues tend to spring up if you have installed a large number of programs over time. Before partitioning, erasing or formatting a hard drive with Disk Utility, be sure to back up any data you want to keep to another location.
You can use it to copy the contents of one partition to another, or to copy a disk image to a partition. You can also create a disk image that contains an exact copy of an entire partition. You can later restore this disk image file to a partition, erasing that partition and copying the data from the disk image to it. Combine disks and partitions into one or more RAID sets and choose whether you want to mirror, stripe, or concatenate your data.
If one drive dies, your data is still available elsewhere. Striping RAID 0 will alternate disk writes between one drive and the other for faster speed. Concatenation JBOD allows you to combine different drives as though they were one, useful in certain circumstances. Browse All iPhone Articles Browse All Mac Articles Do I need one?
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Best iPhone 13 Cases. Best Tech Gifts for Kids Aged Awesome PC Accessories. Your disk might not have a container, and it might have a different number of volumes. Repair volumes, then containers, then disks For each disk that you're repairing, start by selecting the last volume on that disk, then click the First Aid button or tab. In this example, the last volume on the disk is Macintosh HD - Data. Click Run to begin checking the selected volume for errors.
After Disk Utility is done checking the volume, select the next item above it in the sidebar, then run First Aid again. Keep moving up the list, running First Aid for each volume on the disk, then each container on the disk, then finally the disk itself. When done, quit Disk Utility. If Disk Utility found errors that it could not repair, use Disk Utility to erase format your disk. If Disk Utility can't see your disk, it also can't see any containers or volumes on that disk.
In that case, follow these steps:. However, if your Mac doesn't start up all the way, or you want to repair the disk your Mac starts up from, open Disk Utility from macOS Recovery: Determine whether you're using a Mac with Apple silicon , then follow the appropriate steps: Apple silicon : Turn on your Mac and continue to press and hold the power button until you see the startup options window.
Click the gear icon labeled Options, then click Continue.
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