How to increase the internal memory storage of an android tablet?

What do we mean by increasing the internal memory?

The external memory will be converted (shown as) into internal memory and internal memory will be converted into external memory

Things to consider:

  1. This process includes manipulating the system files which might render the warranty of your tablet void.
  2. This process might not work for all tablets
  3. By increasing the internal memory, you can install bigger apps and games which require more memory
  4. Preferably do this when you have installed 8 GB or more external memory

This process has been successfully tested on the Micromax Funbook P255 with internal memory of 4 GB, Usable internal memory of 1.5 GB and External memory (SD card) of 8 GB.

App required: SuperSU and Root Explorer (apk can be downloaded easily from the internet)

Step 1: Install the SuperSU app

  • Go to settings
  • Enable the Super User by selecting a checkbox (in some cases it might be already enabled)
  • Close the app
  • This process is called as rooting.

Step 2: Open the Root Explorer app (it enables us to explore the android system files)

  •   Go to the “system” directory or folder
  •   Then go to the “etc” directory
  •   Scroll down to find the file “void.fstb
  •  Open the “void.fstb” file using a text editor

Step3:  Look for the lines

  • “dev_mount sdcard /mnt/sdcard” and change it to “dev_mount sdcard /mnt/ extsd”
  • “dev_mount extsd /mnt/extsd” and change it to “dev_mount extsd /mnt/ sdcard”

Make sure that you only make changes to the word “sdcard” and “extsd” and nothing else. This will show the internal memory as external memory and the external (SD card) as internal memory.

Once done, save this file and go back to Root Explorer.

Step3:  A backup file named “void.fstb.bak” will be automatically created. Delete this file by pressing hold the file and select delete. Close the Root Explorer app.

Step 4: Switch off the tablet and switch it back on. Go to Settings then storage and check internal storage. The internal memory has changed to 8 GB (storage capacity of the SD card) and the external memory has changed to 1.5 GB i.e. the internal usable memory.

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  • Manish Mannu

    will it work for celkon a64 phone ? it is not a tablet . will it .? please reply

    • Tablet Guru


  • rahul

    what will happen when the memory card is removed

    • Tablet Guru

      Tablet will stop working.

  • HarshJariwala

    help me please ,
    I connect my micromax funbook p275 to my laptop it always shows that USB not recognised
    help me so that I can connect my funbook to my laptop.

  • Harsh Jariwala

    Is this work on Micromax Funbook infinity P275

    • Tablet Guru

      Yes, will work on P275..

      • Harsh Jariwala

        Help me to upgrade operating system by rooting my device 4.0 to 4.4.2 without computer.

      • Harsh Jariwala

        Please help me
        My micromax fun book p275 is not connected to PC
        When I connect it to my computer it shows USB not recognised
        Help me so that I can root my tablet

  • Cyber Tech

    Hi Tablet Guru,

    Can you Please assist me as you done to so many others.

    I have a chines dual siom tablet running android 4.2. when I go the the settings these are what I see so I am confused as its both showing as sdcard0.

    dev_mount sdcard /storage/sdcard0 emmc@fat /devices/platform/goldfish_mmc.0

    dev_mount sdcard /storage/sdcard0 auto /devices/platform/goldfish_mmc.1

  • zali

    cannot open supersu app

  • Kean

    hi bro, i have a question, what if you remove the external memory after that tutorial, is the internal memory will change or it will be the same.

  • Dev Raj

    Will it work in my tablet Micromax p650 ?

  • Jaymark

    Hi can also these work on my samsung galaxy pocket?

  • Cesar Augusto Mejia Rodriguez

    thank you for the guide, already did that on my Vastking V97 and it went perfectly. Now my question is: how do I expand the system memory? It only displays 2GB and I have now, due to your fix a 32GB internal storage and a 12GB external storage… but still I want to expand or even better merge the system with either internal or external one’s! Thank you!!

  • Baltazar

    What will happen to my tablet if i mistake?

    • Tablet Guru

      In worst case, it will stop working.

  • amit

    Showing that no su binary installed plz help

    • Tablet Guru

      Tablet is not rooted then..

  • John

    My tablet show this it’s internal memory is partitioned…. How can I do it?

    dev_mount sdcard /storage/sdcard0 emmc@fat /devices/platform/goldfish_mmc.0 /devices/platform/mtk-msdc.0/mmc_host
    dev_mount sdcard2 /storage/sdcard1 auto /devices/platform/goldfish_mmc.1 /devices/platform/mtk-msdc.1/mmc_host
    ## Example of a dual card setup
    # dev_mount left_sdcard /mnt/sdcard1 auto /devices/platform/goldfish_mmc.0 /devices/platform/mtk-sd.0/mmc_host/mmc0
    # dev_mount right_sdcard /mnt/sdcard2 auto /devices/platform/goldfish_mmc.1 /devices/platform/mtk-sd.2/mmc_host/mmc2

    ## Example of specifying a specific partition for mounts
    # dev_mount sdcard /mnt/sdcard 2 /devices/platform/goldfish_mmc.0 /devices/platform/msm_sdcc.2/mmc_host/mmc1

    # usb otg disk
    dev_mount usbotg /mnt/usbotg auto /devices/platform/mt_usb /devices/platform/musbfsh_hdrc

    • Tablet Guru

      Replace sdcard0 with sdcard1
      and sdcard1 with sdcard0

      in the first two lines.

  • gland boy

    An issue has appeared I touched something on rooting and since then my tablets boots only when it is connected with PC through USB, if i disconnect usb cable off tablet immediately boot icon it appears at tablet. HELP PLS?!!!

  • Mark

    Hey i did what you did. However when i download items from the playstore it doesnt download to tbe memory card. As the figure remains the same

  • kita

    Hey I have a blu studio 5.0 internal usable memory 513mb will this work for me I have a 8gb SD card also but it isn’t putting things on it

  • Lucy

    I have a flytouch xr 10.1 8g what should I install to do this process I have the Root Explorer , but when I try installing the SuperSU it tells me to wait that it is still installing ( which I un-installed because I waited almost a whole day and it stayed the same)??? I have an SD card of 32g and want to swap that for the internal memory as my tablet doesn’t have enough for what my kids use it for. it keeps saying not enough memory. Would it work for this tablet?

    • Tablet Guru

      The process will work. But it seems that rooting procedure is different for your tab, SuperSU will not work . Try another rooting app.

      • Lucy

        Thank you for the response, I have installed a root checker which says it was fine and that my tablet has been rooted, but when I did your process it says it has saved but I can’t find it.
        So I can’t delete the vold.fstab.bak..What am I doing wrong? which root app do you recommend for my tablet?

        • Tablet Guru

          Generally this happen when you tablet is not root properly. I would suggest to try another rooting process. There might be the possibilities that few functionality of your tab is still to be unlocked and root checker didn’t checked it.

          • Lucy

            Still not working, please help as this tablet has run out of memory??????

          • lucy

            Which root checker should I try? since I have already tried four different ones and none have worked. There has to be a way to manipulate it to work. Any suggestions or even visuals will help maybe I am doing something wrong.

          • Lucy

            Which root checker should I try? since I have already tried four different ones and none have worked. There has to be a way to manipulate it to work. Any suggestions or even visuals will help maybe I am doing something wrong.

    • Tablet Guru

      Different tab will have different rooting process. SuperSu will not work with your tablet. Try another process.

  • Tracey

    Thank you for the quick response. Now my problem is I cannot find the void.fstb.bak after making the changes. It does not come up automatically like it does in your video. Any thoughts?
    Thanks again.

  • Tracey

    Hi. My Blu Studio shows:

    dev_mount sdcard/storage/sdcard0 emmc@fat/devices/platform/goldfish_mmc0/devices/platform//mtk-sd0/mmc_host.

    The next line shows:

    dev_mount sdcard2/storage/sdcard1 auto/devices/platform/goldfish_mmc.1/devices/platform/mtk-sd.1/mmc_host.

    Any guidance? (Thanks in advance.)

    • Tablet Guru

      Replace sdcard0 with sdcard1
      and sdcard1 with sdcard0

      • kita

        I have blue studio 5.0 mine looks just like this and I did what u told this person and it didn’t work :(

  • xion

    is this even save to be use? can i revert back to the original after i have done the conversion?

    • Tablet Guru

      Yes, it can done.

  • John

    Adding an SD card does not increase the memory of the tablet, it increases the storage, I.E. Hard drive. Get your facts straight please. When I say memory I am referring to RAM, which is the internal memory of the tablet.

    • Tablet Guru

      Thanks for notifying the error.

  • Juan

    I’m using the Samsung Galaxy Tab 2 and the options are different. I only have one line indicating:

    dev_mount sdcard /storage/extSdCard auto /devices/platform/msm_sdcc.3/mmc_host/mmc1

    Do I just swap “sdcard” and “extSdCard”?

    • Tablet Guru

      Do you see these line sdcard emmc@fat
      If yes, then make it sdcard2 emmc@fat
      and search for sdcard2 auto and make it sdcard auto.

  • abdulrehman

    what if we remove sd card

    • Tablet Guru

      Tablet will crash.

  • secret

    will it work for azpen a701?

  • legend

    will it work for azpen a701?

    • Tablet Guru


  • legend

    will this work for azpen a701?

  • piyush

    hi bro will it work on samsung galaxy grand neo

    • Tablet Guru

      Yes, this method will work for both tab and mobiles.

  • egan

    Will it work on ideatab a1000 if it does not work then I will lose my edutab files my hands are itching i want to play real racing 3 badly.

    • Tablet Guru

      It will work if done correctly.

  • Sarah

    For me the files were called vold.fstab and wfd_backlist.conf, but it had the same info stuff as the ones you had… however I can’t delete the wfd_backlist.conf file; I get an error message saying that the deletion failed… any suggestions? :/

    • Sarah

      Actually wait please ignore that first message ^^’

      I found that the vold.fstab file was equivalent to the void.fstb file you had.

      My problem was it was not saving changes to the vold.fstab file (although it said that it did), and it said it made a backup file called vold.fstab.bak . I searched for that file and couldn’t find it, and when I looked back the changes I had made to the vold.fstab file were gone….

      Maybe I didn’t root the thing correct? My tablet confuses me sometimes :/

      • Tablet Guru

        If the backup file is not created it means changes are not saved. Your tablet seems to be not rooted.

        • Sarah

          I tried to root it again, and I kept getting a notice that said ‘installation failed’

          • Tablet Guru

            Which tablet you have got.

  • Rajasekar

    Please post how to root Micromax P280 as well. Thanks in advance :)

  • Imran Quraishi

    When i edit the lines it is not saved an it shows error

    • Tablet Guru

      Try rooting the tab again.

      • egan

        Will it work on ideatab a1000 if it does not work then I will lose my edutab files

  • Renz matthew notarte

    My tablet is arc mobile 702m . . .is your method . ,can be applicable to my tab plzzz reply. I know that you are expert in this thankzzpllllz

  • bhagwat singh

    Sir tell me ,will this process work on hcl me connect 2g 2.0 ??
    ANDROID 4.1.1 jelly bean
    Plz reply

  • Imran Quraishi

    Can it works on micromax funbook p280

    • Tablet Guru

      Yes, it will work.

  • paulina

    my android tablet micromax p410 shows internal memory under storage. I followed your steps . I changed sdcard2 to sdcard3. this changed the SD card memory to phone storage and vice versa. but internal memory is the same. can please tell me what to change in void.fstab so that to increase internal memory. please advice.

  • Diwash Bista

    I had download supersu but I opened then it says subinary not installed

  • Jerry

    I have an android phone (blu studio 5.0) 4.1.2 version with an internal size of 2GB and external 16GB. I have transferred all my downloaded and movable apps to the sd card I have also made the sd card the primary storage location. Yet I have low memory warnings. In settings it shown that 1.96 of the 2GB internal is available yet I have these warnings and in some cases no access to certain apps like bbm and whatsapp. How can I rectify this?

    • Tablet Guru

      Use the App Link2SD to move the files to external memory card.

  • Pawan

    my android shows internal memory, SD card and phone memory under storage. I followed your steps … I see void.fstab, void.fstab.fat.nand , I changed sdcard0 to sdcard1. this changed the SD card memory to phone storage and vice versa. but internal memory is the same. so what I should do to increase internal memory. please advice.

    • Tablet Guru

      Have you deleted the bat.void.fstab file.

  • prem

    I want to increase memory in HCl me table connect 2g 2.0

  • musa

    Does same process of increasing memory works in 4.2 JB android platform with same micromax 255 hardware specifications.

    • Tablet Guru


  • sagar gandale

    you are running gta and fifa etc games on micromax p255 and it is laging not in just case of these dead trigger,shadow gun etc i am saying that is the problem can be solved increasing processor speed by set cpu app is it work? Is it harmful for micromax p255?please check out upload video on youtube since graphics of tablet good processor should be slightly better