You can also click the Launchpad icon on your dock, click the Other folder, and click Disk Utility.Or, open a Finder window, click Applications in the sidebar, double-click the Utilities folder, and double-click Disk Utility.In most Mac systems, the boot drive will be using Apple’s Mac OS Extended (HFS ) filesystem format, which is a collection of fast-access “B-tree” databases that store where a file is located on your drive, its logical hierarchical organization, and attributes such as file ownership and access permissions.
While such routines can be beneficial if a system is experiencing slowdowns, and should not adversely affect the system if implemented correctly, there is potential for something to go awry.
If you try them yourself, it might cause damage or irreparable loss. If there is physical damage, then consider sending the drive to a professional recovery service since physical damage often continues to degrade the data and simply powering on the drive may make data become irretrievable.
A common and befuddling problem with computers is the sudden and seemingly inexplicable disappearance of an external hard drive that has been functioning properly. Then you can rule out physical damage that requires repair with specialized tools in a controlled environment. In order to repair the most common problems that cause an external disk to suddenly become RAW we will use Test Disk.
Therefore, it is best to regularly ensure the filesystem on your Mac is healthy, especially if you have ever lost power or had to force-restart your Mac.
For the routines below, keep in mind that you can only verify the boot volume, and will not be able to repair it.
This is especially true if you use an outdated version of these software packages that may have a bug or two in it.
While periodic maintenance of your Mac is usually not necessary to keep it running in top shape, one exception is periodically checking your hard drive for errors.
If your Mac's hard drive is experiencing formatting errors, then the system may show slowdowns, failures to properly save or read data, and even file corruption, and eventually it may not even boot.
Unfortunately, formatting errors can happen even if you've just been using your computer in a normal way, so even though your system may be running fine at the moment, it can only benefit from a regular drive check.
Updating boot support partitions for the volume as required. Back up as many of your files as possible, reformat the disk, and restore your backed-up files. I'd use ddrescue (probably available over something like macports or fink) and/or copy anything that means anything in whatever way possible and available to you (I've manually copied out files where even ddrescue failed), check disk health, then reformat the disk.
sudo fsck_exfat /dev/disk2s1 Password: fsck_exfat: Opened /dev/rdisk2s1 read-only ** Checking volume.