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 Country Standard Shipping (business days) Two-Day Shipping (business days) One-Day Shipping (business days)
Contiguous U.S. 4 to 5 Within 2 Within 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.


T10. USB Flash Drives for TV

USB flash drives for TV is one growing usage nowadays. You can enjoy video, audio and image files on your TV from USB flash drive. There are sometimes when a TV does not recognize files on a USB flash drive. What is going wrong? Normally it is because USB device format incompatibility or media file format incompatibility. With this situation, we need to find out what USB device formats and MEDIA types does the TV support? 
Here we have compiled the answers for a list of popular TV brands, including Sony, Samsung, VIZIO and TCL. 
    1. USB Flash Drives for Sony TV

      Supported Video type: .mpg, .m2t;
      Supported Music: .MP3;
      Supported Image: .jpg, .jpeg
    2. USB for SAMSUNG TV

      Your Samsung TV supports a large range of Picture, Video, and Music file types. There are some restriction to the file types (resolution, codec, frame rates, bit rate, etc) which can be found in the charts below. However, there are no limitations to file size.

      Supported “Picture” File Formats

      File Extension
      Max Resolution
      *.jpg; *.jpeg
      15360 x 8640
      4096 x 4096
      4096 x 4096
      15360 x 8640

      Supported “Music” File Formats

      File Extension
      MPEG1 Audio Layer 3
      Supports up to 2 channel
      Supports up to 2 channel
      WMA 10 Pro supports up to 5.1 channel. WMA lossless audio is not supported. Supports up to M2 profile
      type 0 and  type 1 are supported

      Supported “Video” File Formats

      File Extension
      Video Codec
      Frame Rate (fps)
      Bit Rate (Mbps)
      Audio Codec
      Divx 3.11/ 4 / 5 / 6
      1920 x 1080
      (WMV v7, v8, MSMPEG4 v3 1280 x 720)
      ADPCM (IMA, MS)
      H.264 BP/MP/HP
      Motion JPEG
      Microsoft MPEG-4 v3
      Windows Media Video v7, v8, v9
      640 x 480
      1920 x 1080
      3840 x 2160
    3. Flash Drive for VIZIO TV

       MP4 format:  encode the video file should be H.264, and the audio codec should be AAC.
    4. USB Drive for TCL TV

      Supported USB devices formats: FAT16, FAT32, NTFS, EXT2, EXT3, or HFS+.
      Supported Media Types:
      Video – H.264/AVC (.MKV, .MP4, .MOV)
      Audio – AAC (.MKV, .MP4, .MOV); MP3(.MP3, .MKV); WMA (.ASF, .WMA, .MKV), FLAC (.FLAC, .MKV), PCM (.WAV, .MKV, .MP4, .MOV), AC3/EAC3 (.MKV,.MP4. .MOV, .AC3), DTS (.MKV, .MP4, .MOV,.DTS), ALAC (.MKV, .MP4, .MOV, .M4A)
      *4K Video – H.265/HEVC (.MKV, .MP4, .MOV); VP9 (.MKV)
      Playlists –.M3U, .M3U8
      Image – JPG, PNG, GIF (non-animated)
      * H.265/HEVC supported only on Roku devices that support 4K.

Hope it helps. If the issue remains, please check the manual or site of the TV manufacturer. Please feel free to write to us about your experience on this issue, to help us get more on-site experience to share with the other users.

T9: USB fails on non-computer USB device

Normal USB drives support most of USB devices, such as USB speakers, TV, Car stereo, printer, players, sewing machines etc. If the USB sticks fails to play with your USB device, please check the USB drive with a computer and see if it is working well, meanwhile, please check with the manufacturer of the USB device on mainly three points:

1. What USB file system the USB device support? (FAT32/ FAT/ exFAT/ NTFS/ etc);

2. What document format the USB device support?

3. Is there a maximum capacity limit accepted by the USB device?

T8: Drives for embroidery sewing machine

Please check the capacity limit and file format support by the sewing machine with the sewing machine manufacturer.

T7: Flash Drive for Printers

Choosing Flash Drive for Printers

Some rule to follow when using thumb drives with printers.

  1. Always format using FAT32 option
  2. Ensure that thumb drive does not have too many extra files that are not relevant to printing. When you connect the thumb drive to the printer, it is read by the printer and the supported files are searched which may take a long time otherwise.
  3. Connect the thumb drive directly to the printer USB port. Don’t use a HUB for example.

T4: USB Not Detected on Mac

Commonly, when you insert a USB drive in the USB port on a Mac computer, the drive will soon appear on the desktop or hide in the Finder, letting you access, view, and manage data on it. If you come across the situation that no matter how many times you try to connect the USB drive with a Mac computer, the USB drive is not showing up anywhere, please try with below methods.

Fix 1. Check USB port. Change the USB-to-Mac connection port.

Fix 2. Change settings for Mac detecting an external hard disk on the desktop

Occasionally, your Mac has already recognized the USB flash drive but not shown it on the desktop. Thus, you should go to Finder > Preferences > General and make sure the “External disks” option is ticked. Then you’ll see the USB flash drive showing up on Mac desktop.

Fix 3. Change settings for Mac recognize an external hard disk in the Finder

Finder is the other access for us to check a connected external drive on Mac. If your flash drive or external hard drive is not showing up there, go to Finder > Preferences > Sidebar, and under Locations, you need to tick the option “External disks”. By selecting this option, we can make sure that the connected external USB hard drive or flash drive will normally show up in the Finder.

Fix 4. Check the USB drive in System Information

When you cannot find the USB drive on the desktop or in the Finder, try to look for it in the System Information section, which is usually a hidden place for average Mac users.

Step 1. Go to Applications > Utilities > System Information.

Step 2. Check if the system detects the USB drive. Click “USB” on the left panel, and you can also check the USB flash drive information.

Fix 5. Reset USB ports on Mac to detect a USB drive

Step 1. Restart Mac computer, press the Command +Option+P+R keys until the Apple logo appears.

Step 2. Press Command+Option+Esc keys to close all applications that are not responding.

Step 3. Plug the USB which is not showing up to your Mac computer. If it doesn’t show up, click Apple icon and select “Sleep”.

Step 4. Wake up the computer after a few seconds by pressing any key.

Step 5. Shut down the Mac, unplug the power cord, reattach it after 15 seconds.


Fix 6. Repair USB flash drive with First Aid if it doesn’t show up.

Step 1. Go to Applications > Utilities > Disk Utility.

Step 2. Select USB flash drive on the left panel of Disk Utility, and click “First Aid” at the top toolbar and click “Run”. Disk Utility will repair any errors on the drive automatically.


Step 3. Select the USB drive and click “Unmount” at the top toolbar, unplug the USB and plug it back in 10-15 seconds.

Fix 7. Check and fix errors in a not recognized USB with Terminal

Step 1. Open Terminal in Utilities, type: diskutil list and press Return.

Step 2. Find the disk number of your USB flash drive, type: diskutil info disk3 and press Return. (Replace 3 with the disk number of your USB flash drive.)

Step 3. Type: diskutil eject disk3 and press Return. (Replace 3 with the number of your USB.)

Step 4. Type: diskutil list and press Return. When the USB disappear from the Terminal list, close the window.

Step 5. Close Terminal and open Console to inspect your drive errors.

Step 6. Click “Errors and Faults” to check if there are any errors.

Step 7. Reconnect your USB flash drive back to Mac, if no error shows up, your USB flash drive is safe.


T6: Music USB on Cars

Workable USB drives on computers fails to play DIY playlist in car’s system (head unit)

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.
  3. Some head units comes with maximal readable memory size limit up to 4GB capacity.

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. Please check maximal memory size readable by the head units.

T5: Use “ REGEDIT” to set/ cancel “ Write-Protect”

  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

T3: Drive Detected But Not Accessible On Windows

If a drive is detected but not showing up on Desktop nor in My Computer, Please follow below solutions:

Method 1. Reassign a new drive letter to the USB

  1. Press “Windows + R” simultaneously, input “diskmgmt.msc” and hit “Enter” to open Disk Management.


  1. Locate the USB disk partition, right click it and choose “Change Drive Letter and Path…”.

change drive letter

  1. In the pop-up window, click “Change” and assign a new drive letter to the partition.

Always remember that you must assign the name which is not being used by any other drive.

change drive letter 2

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.

Method 2. Run CHKDSK to ensure there is no bad sectors on the USB

If the USB flash drive is corrupted or there are some bad sectors on it, then you could not access it, either. However, you can try to run CHKDSK to fix it.

  1. Click the Search box, type “cmd”, right click Command Prompt icon and select “Run as administrator”.
  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.)

chkdsk command

Method 3. Reformat the USB to a compatible file system

If your USB is formatted to be Ext2/3/4 file system, then you be unable to open it in “My Computer”. That’s because the Ext file system is not compatible with Windows operating systems. So you need to reformat it to other compatible file systems, like FAT32, NTFS, exFAT. You can format it in Disk Management.

Warning: since formatting will erase all data stored in the USB drive, please back up your data before formatting.

T2: Use the drive on both Mac & 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

T1: 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.