USB port types and names

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USB (Universal Serial Bus) is an industry standard for connecting computers and other devices. It's available with many types of ports, and each type has a unique shape. On Mac computers, USB is available with these ports, depending on your Mac model:

USB-A

Type USB-A ports are commonly called USB, USB 2, or USB 3 ports, depending on the USB specification they support. They aren't reversible, so a USB-A connector plugs into the port only when oriented correctly.

USB-C

Type USB-C ports are available as either standard USB-C ports or Thunderbolt 3 ports that also support USB-C connections. They both look the same, and the connector plugs into the port in either orientation.

Learn more about identifying the ports on your Mac, as well as the adapters and cables you can use to connect older devices to type USB-C ports.

USB specifications

USB specifications are important primarily when you want the most speed and power for your USB device, or your device needs more power or is using too much power. Every USB port supports a particular USB specification, which determines the port's maximum>USB specifications on MacData transferPowerUSB 3.1 Gen 2
Also known as USB 3.2 Gen 2
Up to 10 GbpsUp to 15W at 5VUSB 3.1 Gen 1
Also known as USB 3.2 Gen 1 or USB 3
Up to 5 GbpsUp to 900 mA at 5VUSB 2.0
Up to 480 MbpsUp to 500 mA at 5VUSB 1.1
Up to 12 MbpsUp to 500 mA at 5V

To learn which specification is supported by a type USB-A or type USB-C port on your Mac model:

• Choose Apple menu  > About This Mac, click Support, then click Specifications.
• Check the System Information app for more details, including about USB devices connected to USB ports on your Mac. Select USB in the sidebar, then select a USB bus on the right.

Get the best performance from your USB devices

USB specifications all work with each other, but speed and power are limited by the cable or device that uses the earliest specification. For example, if you connect a USB 3 device to USB 2 port, your device is limited to USB 2 speeds, and it can't draw more power from the port than can be delivered over USB 2. In other words, to get the best performance, make sure that the USB port on your Mac and the USB cable to your device meet or exceed the USB specification of the device itself.

If your Mac doesn't recognize a USB device after you plug it into your Mac:

• Check all connections: Unplug the device from your Mac, then plug it back in, and make sure that all cables and adapters are securely connected at both ends. Test with another cable or adapter, if available.
• Plug the device directly into your Mac instead of a USB hub or other device, and if necessary test with a different USB port on your Mac or device.
• Some devices need their own software, such as drivers or firmware. Others work without additional software. Check with the maker of your device, and install all available Apple software updates as well.
• If your device came with an AC power adapter, use it. Some devices can be powered by the USB port on your Mac. Others need more power than your Mac can provide.
• Restart your Mac.

Learn more

• USB 3 devices can create wireless interference that affects Wi-Fi and Bluetooth devices. Learn how to resolve Wi-Fi and Bluetooth issues caused by wireless interference.
• Mac notebook computers with USB-C or Thunderbolt 3 can charge over that port using a compatible USB-C power adapter and cable.

Summary

On this page, you'll learn how to resolve Transcend USB pen drive not detected or not showing up issue by using JetFlash Online Recovery and restore all lost files with EaseUS data recovery software. If you are facing such a problem, follow to troubleshoot this issue without losing data.

'Last night, I transferred some data files from my Transcend 8GB pen drive to the other drive by using cut + paste. Meanwhile, after that, I got an error message. I could not access to my pen drive.

Then I re-plug it to the computer, the light blinked but the drive was not detected. And I got a message, saying that 'please insert a disk into a removable drive G'. How can I repair it?'

When your Transcend USB flash drive is not detected/recognized or Transcend USB pen drive is not working properly in Windows 10,8,7, don't worry. Now, you can fix this error without losing data by using a Transcend USB repair tool - Jetflash Online Recovery and EaseUS data recovery software.

Follow and see how to make your USB work again and restore all valuable data in the following two parts.

Part 1. Make USB Reusable with Transcend USB Pen Drive Repair Tool

For Transcend USB pen drive users, who are facing USB not detected nor working issue, can turn to Transcend USB repair tool - JetFlash Online Recovery to troubleshoot the problem.

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It's developed by Transcend which is designed to fix the 'Transcend JetFlash USB flash drive not working or not detected' issue on Windows PC, by means of restoring the malfunctioning flash drive to its factory default settings.

As JetFlash Online Recovery is not an EaseUS product, you need to download it from its official site: https://www.transcend-info.com/Support/Software-3/.

Guide: repair Transcend USB flash drive with JetFlash Online Recovery

• Step 1: Connect Transcend USB flash drive to your PC and launch this Transcend repair tool - OnLineRecovery.exe.
• Step 2: Connect your computer to the internet, let the program check your USB and click 'OK' to confirm.
• Step 3: Choose the repair mode: Repair drive & erase all data or Repair drive & keep existing data.
• To troubleshoot the 'Transcend USB flash drive not working or detected' problem, only erasing all data can help.
• So, choose 'Repair drive & erase all data' and click 'Start'.
• Your saved files on Transcend USB flash drive will be permanently deleted by then.
• Step 4: Wait patiently until the repairing process completes. Click 'Exit' to finish the process and unplug the device.

Now, re-plug your Transcend USB flash drive back to the computer. Windows will immediately detect your drive once it's connected.

Don't worry if your documents, music, pictures or applications on the drive have been removed by JetFlash Online Recovery.

In the next part, you'll find reliable file recovery software provided by EaseUS to fully restore the lost files on USB.

Part 2. Recover Transcend USB Lost Files with EaseUS File Recovery Software

Most users indeed can do nothing to avoid file loss while fixing Transcend USB flash drive and pen drive not detected and not working error with JetFlash Online Recovery. The best way should be backing up data before trying to repair.

But if you are unable to access the undetectable USB to back up files, don't panic. First, refer to Part 1 for a detailed guide to repair the undetectable USB. Next, apply reliable data recovery software for help.

EaseUS Data Recovery Wizard supports to recover data from Transcend memory card, USB flash drive, pen drive, etc. due to formatting, deletion, virus infection, etc. in only 3 steps.

Guide: Recover Transcend flash drive data with EaseUS Data Recovery Wizard

Step 1. Choose the flash drive to scan.

Launch EaseUS Data Recovery Wizard and choose your flash drive where you lost important files. Click 'Scan' to start.

Step 2. Check and preview found flash drive data.

After a quick and advance scan, you can quickly locate a specific type of file by using the Filter feature as well as the Search.

• Filter: A quick way to your wanted files.
• Search: e.g. File name/file extension.

Step 3. Restore flash drive data.

After checking and finding lost flash drive files, select them and click Recover to restore. You shall save the found files to a safe location on your PC rather than to your flash drive.

Protect Files/Data on Transcend USB Flash Drive/Pen Drive

Knowing ways to repair not working or undetectable Transcend USB pen drive is not the best way for data protection. Here we have some more practical tips to help you protect files and data on your Transcend USB flash drive, pen drive:

1. Back up valuable files regularly

With a backup, you can always survive when data loss issues occur or your Transcend USB pen drive becomes undetectable or even stop working. To do so, we'd like to suggest you back up files to another external hard drive or USB with reliable file backup software.

EaseUS Todo Backup with its File Backup feature enables you to fully back up desired files at one time in only three steps. This will save your time and storage space on the target device.

Step 1: Launch EaseUS Todo Backup and choose 'Disk/partition Backup'.

Step 2: Choose disk partition that you want to back up. Then select a destination where you want to store the backup file.

Step 3: Click 'Proceed' to start the data backup process.

2. Check and repair existing error regularly

When the USB pen drive contains internal file system errors or other unknown issues, you'll not be able to use it. Use Disk Error Checking tool to check and repair internal errors regularly is also necessary:

• Step 1: Connect USB to PC, open File Explorer and right-click on the USB.
• Step 2: Click on 'Properties', go to the Tools tab.
• Step 3: Click on the Check button under the Error checking section.
• It will scan the drive and repair it if errors were found.

3. Clean up virus with antivirus software

Virus infection will also cause the storage devices not working issue. Use antivirus software to clean up virus and malware is also important.