Hard drive cannot be detected mac
When you attach your USB devices, have Console running and watch to see if the device is detected and whether an error is generated. If nothing happens here with both devices then you have ruled out your USB devices. If they are being recognized in the system, but not showing up, you may have to disconnect them and remount them in Terminal.
First, see if it appears in Disk Utility. If it appears but is not mounted, you can select the mount option which should mount your disk. Then, click on the Apple logo in the top left corner and select about my Mac. It should appear under storage. Also try going to the system report under the overview tab.
People have also reported that it might not be receiving enough power if you have to plug it in. Have you dropped your mbp? I dropped mine once and the cable connecting the right side ports wasn't truly connected anymore. This lead to external hdds not being recognised and once recognised disconnecting without prompt. In my situation, that was the problem! I believed that you must always have power on your devices before plugging them into the Mac. But no drive showed up! Sometimes it worked but I didn't know why. Usually a Mac restart fixed it I lived with this I'm using a two-drive USB hard disk case.
So I am just adding this answer for others that have the same situation. That may be all it takes to solve it for you like it did for me! That was how I discovered that my USB device was detected by the computer but advertised no storage units. Thank you for your interest in this question. Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site the association bonus does not count.
Would you like to answer one of these unanswered questions instead? Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Sometimes Mac doesn't recognise my external hard drive Ask Question. Asked 3 years, 1 month ago. Active 11 months ago. Viewed 58k times. What could be the problem? Remember, we're not there to look over your shoulder.
Also, can you expand on the external drive as well? What do you mean "restart several times"? Click Ok when you are finished. Changing the drive letter may force Windows to recognize the hard drive. Right-click any unallocated space. If there is any unallocated space on the hard drive, it needs to be initialized in order to be recognized by Windows.
Click Initialize Disk. This opens a window that allows you to initialize the Disk. Click Ok. This initializes the disk so that it is recognized by Windows. Format the drive.
If the external hard drive was formatted on another computer platform, such as Mac or Linux, it may not be recognized by Windows. If all else fails, you can reformat the drive for Windows. If you plan on using it with other devices, select FAT32 as the file system.
Warning: Formatting the external hard drive will permanently erase all the data on the external hard drive. Use this step as a last resort. If possible, try to backup any files you want to keep to another computer.
Use the following steps to format the hard drive. Right-click the external hard drive in Disk Management.
1. Change the Finder settings
Click Format. Type a name for the drive. Method 4. Open the Finder. Click Finder. It's in the menu bar at the top of the screen on the left next to the Apple icon. This displays a drop-down menu.
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Click Preferences…. It's the second option in the "Finder" menu. This displays the preferences menu. Click the General tab. It's the first icon at the top of the preferences menu. It has an icon that resembles a light switch.
Solved: USB Flash Drive Not Showing Up On Mac
Click the checkbox. Method 5.
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Reset the SMC. The way you reset the SMC is different depending on what type of Mac you have. Method 6. Click Applications. It's in the side bar to the left. This displays all the applications installed on your Mac.
Click Utilities. It's the blue folder in the Applications. This displays all the utility programs for your Mac. Click the external hard drive volume.
It's listed below the drive name in the sidebar to the left. This displays how much of the external hard drive has been used. Click Mount if available. This button is at the top of the Disk Utility app. This forces Mac OS to read the external hard drive. If the button says "Unmount", the external hard drive is already mounted.
If the "Mount" button is grey out, Mac cannot read the disk. Click First Aid. If there is no volume for the external hard drive, or the mount button is greyed out, Mac cannot access the external hard drive. Click "First Aid" at the top to scan the external hard drive for errors. Click Run.
It's in the prompt that appears when you click "First Aid". This runs a scan of the external hard drive and attempts to fix any errors. Click Repair Disk. If First Aid finds errors on the external hard drive, it display a list of the errors and ask if you want to repair the external hard drive. Click Repair Disk to fix the errors on the external hard drive. If First Aid is unable to repair the external hard drive, it may be formatted in a file system that MacOS can't read, or it may be a faulty external hard drive.
How to Recover External Hard Drive Not Showing Up on Mac
Click Partition or Erase. If the external drive has be formatted using a file system that can't be read by MacOS, you could either partition the unused portion of the external hard drive, or erase the entire drive and reformat it in a file system that can be read by MacOS.
If you plan on only using the the external hard drive, select Mac OS Extended as the file system. Warning: Erasing and reformatting your external hard drive will erase all the contents on your external hard drive. Use that as a last resort. If possible, try to back up the contents of the external hard drive to another computer before reformatting it. Use the following steps to partition or erase your external hard drive: Partition: Click Partition in Disk Utility.
Type a name for the partition next to "Name:. Select a format for the partition next to "Format:". Type how much space you want to allocate to the partition next to "Size:". Click Apply. Include your email address to get a message when this question is answered. Already answered Not a question Bad question Other. Edit Related wikiHows. Article Info This article was co-authored by our trained team of editors and researchers who validated it for accuracy and comprehensiveness. Categories: Mac Print Edit Send fan mail to authors.