After a Mac computer has experienced a computer crash, sudden power failure, direct plug-in of an external hard drive, etc., you may find that the computer cannot be turned on normally after restarting, or the system cannot be entered after booting. Under Disk Tools, the disk shows that it is not mounted. This article will use a short article to introduce the reasons why the mac disk tool shows that it is not loaded and the disk read and write speed is slow. If you also encounter the above problems, you can refer to the following solutions to try to solve them.
1. The mac disk tool shows that it is not loaded
1. After troubleshooting the problem of improper hard disk connection, the computer still shows that the hard disk is not loaded correctly. You can try to open the Mac command line and try to load it manually through the command line.
Enter "diskutil list" to view the current hard disk list. According to the hard disk size SIZE value displayed in the hard disk list, find the path of the hard disk to be mounted, such as "/dev/disk3", and then enter "sudo diskutil mount /dev/disk3" to mount the hard disk.
Figure 1: Command line mount hard disk
2. If the loading is still not successful, you can try to enter "ps aux|grep fsck" to check whether there is an fsck process that detects the consistency of the file system. If so, you can enter "sudo pkill -f fsck" to close the fsck process. Then use the "sudo diskutil mount /dev/disk3" command to mount the hard disk.
Figure 2: Checking the fsck process
3. Of course, in addition to the mounting problem, it may also be that the hard disk cannot be loaded due to some reason. In this case, you can click "First Aid" in Disk Utility to try to diagnose and repair the error. After the repair is complete, click on the right "Mount" button to mount the hard disk.
Figure 3: Hard Disk First Aid
Second, the reasons for the slow disk read and write speed
1. The mobile hard disk runs multiple applications on the hard disk at the same time. For example, when you transfer files, you also perform other operations, such as watching video files stored on the hard disk, which will take up too much disk IO and eventually lead to the speed of reading and writing of the mobile hard disk. slow.
Figure 4: Disk IO read and write process
2. The power supply of the USB port is insufficient. When the power supply current of the USB power supply port is too small, if it is just lower than the current required for the normal operation of the current mobile hard disk, it will cause the hard disk to read and write slowly, but it will not cause connection or failure. Mount error.
You can view the current available current value of the USB port in the hardware USB interface of the system information.
Figure 5: View USB current
3. There are too many fragmented files in the hard disk. When the mobile hard disk stores too many files and repeatedly deletes and saves data during long-term use, disk fragmentation may occur, which will slow down the computer when accessing data on the mobile hard disk.
You can use the CleanMyMac software to scan, view and clean up fragmented files in the hard disk.
Figure 6: View Fragmented Files
3. How to detect and repair hard disk errors
1. Generally speaking, if there is a problem or damage to the hard disk, it will slow down the reading and writing speed of the system, so how to detect and repair the problem of the hard disk?
The solution is mainly to download and install Tuxera NTFS For Mac software. This software can help users check and repair various explicit and implicit problems in the hard disk. It is also equipped with a safe uninstall function to help users unplug the hard disk reasonably and safely. Prevent hard drive errors.
Figure 7: Detect and fix issues
2. In addition, it also helps NTFS and other Windows hard disks to obtain read and write permissions on the Mac system, and the read and write speed will not be limited by the system, which solves the problem of incompatibility between hard disks between systems.
Four. Summary
This article will answer the reasons why the mac disk tool shows that it is not loaded and the disk read and write speed is slow. Users can try to solve the problems encountered through the solution proposed in this article, and through the combination of software and hardware such as Tuxera NTFS For Mac, Reasonably uninstall and install the hard disk, take good care of the hard disk in hand, and prolong the service life of the hard disk as much as possible.