Why usb data transfer is so slow ?

AsusYouzrAsusYouzr Level 2
edited February 2021 in ZenFone Max Pro Series

Please tell us some basic information before asking for help:

  1. Model Name:601kl
  2. Firmware Version: 087pie
  3. Rooted or not: Not
  4. Frequency of Occurrence: always
  5. APP Name & APP Version (If your issue relates to the app): default file manager and mi file manager

In addition to information above, please also provide as much details as you can, e.g., using scenario, what troubleshooting you've already done, screenshot, etc.


Screen shot attached.. when i transfer data from phone to pen drive via OTG cable .. it's too much slow.. 1gb of data takes too much time to copy on a pen drive. Shows 1.44 mb max speed and below. Pen drive is sandisk cruzer blade 16gb...

Same pen drive gives 14mbps transfer speed on a computer.

I want to know is this normal speed for a phone ?

Or this phone can transfer max at this speed only.

Same slow speed on default file manager ..and also in Mi file manager app.


  • Have you tried with a different pendrive? Is the speed is same?? Like is it slow with any pendrive?



    Mir**pur S2 now!!!! ;-)

  • Same with other pen drives.. too much slow...it will take a decade if transfer 10gb of data..

    Mir**pur s2 stored months ago..now to free storage...i want to transfer to external storage...but this turtle speed amazed me (^_-)

  • Can anyone check transfer speed on pen drive connected with otg cable .. mi file manager app to transfer and check maximum speed.

  • Hey, I checked it right now on MPM1 (4GB, 64GB) with SanDisk 64GB MicroUSB Pendrive and unfortunately mi file manager could not even read the files, so I just transferred a 1.43GB file to my pendrive directly connected to the charging port and the time taken was 82 seconds (Tested 3-4 times, all the reading - 81, 82, 80, 83 seconds) with simple calculations (I was not able to use mi file manager so I don't have the transfer speed) the average speed was 17.8MB/s which is not bad.

    I suggest you 3 ways, give them a try and get back to us-

    1. Change PenDrive
    2. Try different file manager, the in-built file manager is good enough or you can try Google Files
    3. May be the problem is with the file type, I got 17MB/s with rar file, test the transfer speed with different file type

    And also via OTG my mobile couldn't detect the pendrive

This discussion has been closed.