FAQ on USB Flash Drive

The list of FAQ on USB Flash Drive is presented as below. If you do not find any answer to your question, please feel free to contact us.

Bulk Pack USB Flash Drive

The Actual Storage Vs. The Label Storage

The actual storage is approximately 93% of the label storage. Why? The key is the different definitions of a Megabyte (MB) from a Operating System and the Flash Memory Manufacturers. Please see the details as below:
Definitions of a Megabyte:
1. Operating Systems commonly define capacity as follows:
     – Kilobyte (KB) as: 2 to the 10th power (1,024 bytes)
     – Megabyte (MB) as:  2 to the 20th power (1,024 X 1,024 bytes = 1,048,576 bytes)
     – Gigabyte (GB) as: 2 to the 30th power (1,024 X 1,024 X 1,024 bytes = 1,073,741,824 bytes)
2. Disk Drive and Flash Memory Card Manufacturers commonly define a MB as one million bytes (exactly 1,000,000 bytes) and a GB as one billion bytes (exactly 1,000,000,000 bytes).
In this way, a normally named 16 GB USB flash drive owns around 14.9 GB actual memory storage space.

The LED light on blue & black USB

All the Enfain SWIVEL USB comes with LED light on the PCB board. For blue and black USB, their casing material is hard to transmit the light so it seems visible from the sides of the casing but the light is seen from the hole at the end of the case.

Shipping and delivery issue for FBA orders

If you choose Fulfilled by Amazon(FBA), the orders will be shipped by Amazon. Shipping time as below. (Please click HERE for more about the shipping time by Amazon team.)
Destination CountryStandard Shipping (business days)Two-Day Shipping (business days)One-Day Shipping (business days)
Contiguous U.S.4 to 5Within 2Within 1
Regarding the shipping and delivery issue of FBA orders, please contact Amazon Customer Service directly for quick updates. Amazon Customer Service could be contacted with below ways:
2. U.S. and Canada: 1-866-216-1072 — International: 1-206-266-2992
3. Amazon Customer Service:
(1). Use your Amazon account to log into www.amazon.com
(2).Pull down to the bottom of this page and find “Help” button , and click on it to get into a new page
(3). Find “Need more help ” in the middle of this page and move it to this button and you will see “Contact Us ” and click on it .Then you will get in touch with Amazon Customer Service Associate.

Warranty for Enfain® products

The warranty terms is presented in the product page. For the USB drives, we provide 12-month manufacturer warranty.
If you are unhappy with our products, you could contact Amazon within 30 days since purchase for a return/refund. If you are beyond the 30 days windows, please feel feel to contact us, we will provide you a replacement or partial refund for the defects, without returning. 

Discount for USB pack with large quantities? 

If you are a registered Amazon business buyer, you could see the tiered pricing on site automatically. If you fail to see the tiered pricing when you want to purchase more than 5 packs, please email us with your order number within 3 days since purchase date, we will credit the discount to your Amazon account.

Custom Orders

Artworks request

Designed artworks is requested to make custom USB flash drives.

Preferred format: Vector PDF, EPS, AI, CDR

If you do not have vector format as above, please send us high resolution Bitmap graphics as PNG, JPG, TIF.

If you only need to print texts, please send us the text with preferred fonts and colors.

A digital proof will be made for free and sent to you within 1 work day.


Shipping and delivery issue for custom USB orders

All the custom USB orders will be shipped from Enfain factory in China. We use DHL (HK) express for all the custom orders. Once shipped, a tracking No. will be offered and it could be tracked on WWW.DHL.COM. It takes 4-6 work days to deliver since pickup.

Print logo and time schedule?

We could print or engrave your logo on the USB drives. You may refer to page ” custom USB“.

  • MOQ :  Swivel – 100 pcs/SKU.  Card-50 pcs/SKU. Wood – 50 pcs/SKU.
  • No additional charge.
  • Procedure and time schedule:
  1. Please search ” enfain custom usb drive ” in Amazon searching bar.
  2. Order & Custom request communication: Please send LOGO designs ( EPS/PDF vector format) to us.
  3. Image proof: we will provide a digital image sample to customers for approval.
  4. Production:  3-5 work days for production once the digital sample is approved.
  5. Shipping:  4-6 work days for shipping by DHL.
  6. Feedback: Let us know how we did.


Music USB on Cars

Music USB on Cars – refuse to play on cars

A lot of users use the USB drive to store music/ tracks from iTune/ the computer and play it on vehicles. Sometimes it happens that the tracks are saved on the flash drive but fails to play on the cars. I would suggest the users who ‘d like to make a DIY playlist on cars, please learn the following points:

  1. Normally computer reads FAT32/ exFAT/ NTFS, but a lot of car USB reads FAT32 only.
  2. Computer reads more formats of music while cars read MP3 format generally.

If you have already come across issues with playing tracks on a car, please follow below steps to check:

1. Format the USB drive as FAT32. Make sure to back up the music before re-format action.
2. Check if the music (song) is in MP3 format which vehicle and computer both support.
3. Put the music tracks in the USB drive directly, without saving them in different files.
4. Is there a capacity limit for the USB playing on your vehicle? Some vehicles only read small capacity USB.

Use “ REGEDIT” to set/ cancel “ WriteProtect”

  1. Plug USB
  2. Press ” Win + R “
  3. Imput ” regedit” and RUN
  4. Go to  HKEY_LOCAL_MACHINE\SYSTEM\Current\ControlSet\Contro
  5. Create a new entry and name it “StorageDevicePolicies”
  6. Create a new DWORD 32 digits and name it “WriteProtect“
  7. Open “WriteProtect” and change the data to “1” and Save

Assign a drive letter for USB

Sometimes, the computer cannot assign a drive letter for external USB drive owing some unknown reasons.

Thus, you can plug your drive into the computer and manually assign a drive letter for it.

Detailed steps:

Step 1. Press Win + R to open the Run windows and type diskmgmt.msc

Step 2. Right-click your drive, select Change Drive Letter and Paths from the context menu.

Step 3. Click Add, select a drive letter in the drop-down menu and hit OK.

Step 4. See if you can open your drive and access your data.

USB Drive Detected But Not Accessible

USB drive detected but not accessible is common problem particularly with new USB drive. However, you may also encounter the same issue with external storage devices such as hard drives, memory cards. Due to this problem, whenever we connect external storage device with PC, it gets detected easily, but it doesn’t allow us to access files or data stored within it.

Fortunately, this problem can be solved by following below solutions. It is suggested that you must follow the solution one by one and check if your problem is fixed or not.

  1. General Troubleshooting – Check USB Port

Before, you try any other technical solution, you must first check the USB port on your computer. Try to plug your USB in another USB port of your PC – if it works on another port then, the first USB port might be dead. If you are using a USB hub, then connect the drive directly and see if it is working or not – it is because some of the USB hubs are not able to provide enough power supply to function external drive.

If still, the drive doesn’t show up in “My Computer”, then connect it to another PC’s USB port, just to check whether the drive itself has got bad or corrupt or your PC has certain problems. You must check your drive appear in the computer’s Disk Management window. If it does not show up then you might be using a dead drive that needs replacement.

  1. Does your USB drive appears in My Computer

When you say USB detected but not accessible, then does it means that drive not allowing to access data stored within it or the drive detected but it is not showing up in My Computer.

When you said USB detected but not accessible, do you mean the pen drive not showing data or the pen drive detected but not showing in My Computer?

 (i) If USB drive detected but not showing up in My Computer

Check if it appears in Disk Management. Check below steps:

  • To open Disk Management, click Start and type diskmgmt.msc in the search bar and hit ENTER.
  • Now, Disk Management will get open, here you can check whether your USB is showing up or not.

(ii) If USB drive detected but you are not able to access it

If this is the case that your USB is recognized by computer, but you are not able to open files and folders stored within it, then it is recommended that you get a USB drive data recovery software to restore the files.

  1. Does your USB drive show up in Disk Management?

(i) If USB drive show up in Disk Management

If your USB appear in Disk Management but it is not accessible, then it means that drive got corrupted or there is error in the disk.

In this case, follow the below steps to fix this problem:

  • Click Start> type msc in search bar and hit ENTER.
  • This will open Computer Management.
  • Now click on “Disk Management” located on the left hand menu.
  • In the Disk Management option, you can see the list of hard drive, this will also display your USB drive. Now right click on your USB drive and select “Change Drive letter and paths”.
  • A small window will pop-up. Click on “change” and assign a new drive letter name to your USB. Always remember that you must assign the name which is not being used by any other drive.

That’s All!

Once drive letter name changed, your USB drive will show up in My Computer and you will able to access data from it. If not then reboot your system and then check.

In major cases, this solution have seems to work great. However, if your USB does not appear even after following the above steps then it is suggested that you contact us for a refund or replacement.

 (ii) If USB drive doesn’t show up in Disk Management

If your USB drive is detected but it doesn’t appear in Disk Management, then you can need to update the driver software. Below follow the steps to do this.

  • Go to “My Computer” and click on “System Properties” and then on Device Manager located on left pane.
  • Device Manager window will get open. Now, next to “USB controller” click on the Plus (+)
  • You will see a yellow exclamation markRight click and select “update driver software” and choose “automatically search for driver software online“.

Simply wait and let driver to get installed on your PC. Once driver get installed, reboot your computer and then reconnect your USB and see whether you are able to access files stored within it.

Now let’s know the solutions on how to fix USB drive detected but not accessible on Mac.

You can make use of Disk utility feature to fix USB drive detected but not accessible on Mac.

Here follow the steps:

  • Open Disk Utility by opening Spotlight (cmd+space-bar) and type Disk Utility and hit ENTER. Search in the list on the left and see if the USB drive appears there.
  • If there is USB drive in Disk utility, then check underneath for a Volume. If it is available there, then click on it and select Mount. If your Mac has already mounted it then you will see unmount option instead.
  • If Volume is not listed there, then it means that your Mac is not able to access drive. You will see that Mount option is greyed out.
  • Here you will have three options – First Aid, Erase and Restore. Click on “First Aid” option to check for errors and then repair the drive if required. If first aid detects any errors, then you can easily fix it by yourself by clicking on “Repair Disk” option.
  • If your Mac not able to repair the drive then it is likely that your USB drive is completely damaged or broken or drive is formatted using a file system that Mac cannot read.
  • If you do not want to restore data then you can simply click on Erase option to erase all data and your Mac will reformat your USB drive.
  • If you want to restore data from USB drive such as pictures, videos or audio files, then you can use Photo Recovery software.

Some people also ask – how to fix flash drive not showing up on Mac?

In such situation where your USB flash drive does not show up on your Mac computer, then you must consider to follow below solutions:

Check your Mac is set to show mounted flash drive on the desktop. Open Finder > Preferences > General and see that there is a tick beside external drive. If it is not ticked mark then tick mark it.

Make sure the flash drive is connected properly on your Mac. Also make sure that USB port is working and not damaged. Try plugging the drive to another USB port. If you have only one port, then plug another device and see if it works fine. Try to connect your drive to another Mac and see if you are able to access the drive on that Mac.

Use the drive on both Mac and Windows

Solution: Format the flash drive as exFAT or FAT32

WARNING:  Backup all your data before formatting. Formatting will erase all data on the memory device.

Formatting a flash drive to exFAT or FAT32 on a Windows computer

  1. Double-click My Computer, or Computer
  2. Right-click the drive letter associated with your memory device, then select Format
    WARNING:  Make sure you select the correct drive letter.
  1. Select a File systemtype. – exFAT
  1. Ensure “Quick Format” is checked
  2. Click Start.

Formatting a flash drive to exFAT or FAT32 on a Mac computer

  1. Open Disk Utility.
  2. In the top menu bar, go to View, and choose Show All Devices
  3. Select the upper level of the drive you would like to format and click the Erase button
  4. Choose how you would like to format the drive
    • Enter a Name for your drive
    • Choose exFAT for the format
    • Choose Master Boot Record for the Scheme
    • Click Erase
  1. When finished, the drive will be formatted and repartitioned successfully. Click the Done button

Transfer a 4GB or larger file to USB drive

Due to FAT32 limitation, files larger than 4GB can NOT be stored on a FAT32 volume. Formatting the flash drive as exFAT or NTFS will resolve this issue. Please make sure to backup the data before reformatting.

WARNING: Backup your data. Formatting will delete all the data in your device.

SOLUTION 1 – Format in exFAT

exFAT file system that allows a single file larger than 4GB to be stored on the device. This file system is also compatible with Mac.

Windows 7 and Mac OS 10.6.6 and higher are compatible with exFAT out of the box. Older operating systems may need a patch installed for exFAT compatibility.

NOTE: exFAT file system is NOT compatible with some host devices such as TV, game systems, older operating systems, car stereos etc.

Formatting a drive in exFAT

  1. Double-click on My Computer.
  2. Right-click on the flashdriveor memory card, then select Format.
  3. In the File Systemlist, click exFAT.
  4. Click Start.
  5. Click OKto start formatting.


SOLUTION 2 – Format in NTFS


– Formatting the device as NTFS will make it unwriteable on a Mac computer. Most Mac computers can read NTFS, but not write.

– NTFS is a journaled file system, this creates more read/write activities. Therefore, it MAY decrease life expectancy of your device.

– Once the device is formatted as NTFS, you MUST use “Safely Remove Hardware” to remove your device.

STEP 1 – Optimize the flash drive for performance

  1. Plug in the device to the PC.
  2. Open The ComputerManagement Console
  3. On the Left side select Device Manager
  4. On the right side expandDisk Drives
  5. Right-click on the flashdrive, then select Properties.
  6. Click the Policytab.
  7. Select Optimize for performance, then click OK.


STEP 2 – Format the flash drive

  1. Double-click My Computer.
  2. Right-click on the flashdrive, then select Format.
  3. In the File systemlist, click NTFS.
  4. Click Start.
  5. Click OKto start formatting.
Any other inquiries please feel free to send us message via Contact or email us cs@enfain.com. We will respond to you within 24 hours.