So, a Thunderbolt 3 device is connected to a 'Touch Bar' MacBook Pro using the Thunderbolt 3 standard via a USB-C shaped port.Provide a Name for the volume. Thunderbolt 3 combines Thunderbolt, USB, DisplayPort and power via a single USB-C connector. The simplest explanation is that USB-C refers to the shape of the port and Thunderbolt 3 refers to the connectivity standard.So if anything happens to your Mac you can restore your entire Mac from a Time Machine backup. WARNING: Formatting the drive will erase all.The case: “USB flash drive detected but not accessible”Reason 1, your Mac can use a Seagate external hard drive formatted as HFS+ for a Time Machine backup. Set Scheme to GUID Partition Map.
If you are mainly running Windows PC, but the external hard drive is formatted to be Ext2/3/4, then it cannot be recognized by your computer.Of course, there are some other causes for this issue including bad sectors on the disk, virus infection, or insufficient USB power supply. If a partition of the flash drive comes without a drive letter, then you cannot see it in Windows File Explorer.▶The current file system is not compatible with Windows 11/10/8/7. In such a case, you may find the USB drive recognized in Device Manager, but not in Disk management.▶The USB does not have a drive letter or share a common drive letter with another partition. So it can be detected in Disk Management but not accessible in My Computer.▶The disk driver is outdated. If the flash drive is a brand-new disk, and there is not any partition on it, then the system won’t recognize it. Thats all how you can install VMware tools on macOS High Sierra to fix screen.As for why USB flash drive is not accessible in Windows 11/10/8/7, below are the main reasons you might need to take into consideration:▶The USB drive is not partitioned at all. If it is normal and can be accessed, then there must be something wrong with the first port.If it still does not work, then connect the USB to another PC’s USB port, just to check if the USB stick itself is dead or your PC goes wrong. Insert your USB into another port on your PC and check whether it is accessible. For example, you ought to check the USB port on your current computer is fine or not. ✔ General solutionsBefore going for some technical solutions, you can try the easiest thing first. Now, you can try them one by one until the issue is solved successfully. Best av for macBelow we will explain how to fix this problem in two cases. But the different situations require different methods. ✔ Technical solutionsIf the drive itself, connect ports and computers are all fine, you might need to try some technical fixes to resolve the USB detected but not accessible issue in Windows 11/10/8/7. In this case, you can reassign a new drive letter to it in Disk Management by following the below instruction.1. Reformat the USB to a compatible file systemIf the USB lacks a proper drive letter, or has the same drive letter as other drives to stuck into a conflict, then there is a possibility that you cannot open it in File Explorer. Run CHKDSK to ensure there is no bad sectors on the USBMethod 3. Reassign a new drive letter to the USBMethod 2. In the Command Prompt window, type "chkdsk g: /f /r /x" and press “Enter” (where the “g” stands for the drive letter of your USB flash drive).If running such commands is never what you are good at, you can try AOMEI Partition Assistant Standard , which offers a quite easy way to check bad sectors on hard drives.As mentioned above, if your USB is formatted to be Ext2/3/4 file system, then you will be unable to open it in “My Computer”. Click the Search box, type “cmd”, right-click Command Prompt icon and select “Run as administrator”.2. However, you can try to run CHKDSK to fix it.1. Run CHKDSK to ensure there are no bad sectors on the USBIf the USB flash drive is corrupted or there are some bad sectors on it, then you could not access it, either. In the pop-up window, click “Change” and assign a new drive letter to the partition.Method 2. Locate the USB disk partition, right-click it and choose “Change Drive Letter and Path… ".3. Right-click the USB device and hit on “Format Partition”, then verify the “NTFS” as the new file system, click “Apply” in the toolbar to finish the formatting.This freeware also supports repartitioning USB drive into multiple partitions. Below we will show you how to format Ext4 to NTFS as an example.Warning : since formatting will erase all data stored in the USB drive, please recover important data from the inaccessible drive using professional data recovery software.Download the freeware, install and launch it. Also, you can use AOMEI Partition Assistant Standard, which is a more powerful disk formatting utility and can finish some tricky hard drive formatting tasks Disk Management cannot complete such as formatting over 64GB hard drive to FAT32. So you need to reformat it to other compatible file systems, like FAT32, NTFS, exFAT.You can format it in Disk Management. Can I Use Longer Name For Usb In Plus It DoesIf you meet New Simple Volume greyed out error, turn to AOMEI Partition Assistant Standard.1. Generally, you can solve this issue by creating a new partition in Disk Management. Update device driver for USB driveWhen there is not any partition existing on the drive, you can just see it in Disk Management shown as unallocated space, plus it does not appear in “My Computer/This PC”. Create partition on the USB driveMethod 2. For such a situation, the solutions below are worth trying.Method 1. USB detected in Disk Management but not showing up in File ExplorerIf your device is detected by your computer, but it does not appear in File Explorer, then you cannot access any data within it. Right-click on the disk and select "Update Driver Software" from context menu.4. Expand "Disk driver " and locate the USB which cannot be found in Disk Management.3. Right-click on Start, click “Device Manager”.2. Below is how to update the device driver.1. Back to the interface, click "Apply" to commit the pending operation.This method works for the USB drive even not showing up in Disk Management. In the mini window, you can set the partition size, drive letter, file system according to your needs.3. Click on First Aid to check for disk errors and then click on Repair Disk to fix them if required.If your Mac does not repair the inaccessible USB drive successfully, there is a chance that your USB drive is damaged or broken. If there is one, then click on it and select Mount.> If the USB drive is not in the Disk Utility, then it means that your Mac is not able to access drive, and you can see the Mount option is unclickable.> Then you will have three options to tackle this issue: First Aid, Erase and Restore. Search in the left list and check if the inaccessible USB is there.> If the USB drive is in the Disk Utility, then check whether there is a volume underneath it. After that, you can reboot your computer and reconnect your USB and see whether the USB detected but not accessible issue is fixed or not.Bonus tip: USB detected but not accessible in MacThe above is all about how to fix USB flash drive detected but not accessible on Windows PC, here we also want to tell you what to do when USB detected but not accessible in Mac.First of all, press cmd+ space-bar at the same time to open Spotlight, the input Disk Utility and hit on Enter. Besides the above-mentioned methods, in Windows, you can also use AOMEI Partition Assistant Standard to rebuild MBR on the USB drive to check whether the issue can be resolved. Wrap things upAfter going through this article, now you must have learned why USB detected but not accessible occurs, as well as how to fix this issue in Windows and Mac. In this situation, you can recover data from it first, then click on “ Erase” option to wipe all data and reformat it.
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