How many mmcblk devices is normal?











up vote
2
down vote

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Why so many mmcblk devices?



/dev/block/mmcblk0
/dev/block/mmcblk0boot0
/dev/block/mmcblk0boot1
/dev/block/mmcblk0p1
/dev/block/mmcblk0p10
/dev/block/mmcblk0p11
/dev/block/mmcblk0p12
/dev/block/mmcblk0p13
/dev/block/mmcblk0p14
/dev/block/mmcblk0p15
/dev/block/mmcblk0p16
/dev/block/mmcblk0p17
/dev/block/mmcblk0p18
/dev/block/mmcblk0p19
/dev/block/mmcblk0p2
/dev/block/mmcblk0p20
/dev/block/mmcblk0p21
/dev/block/mmcblk0p3
/dev/block/mmcblk0p4
/dev/block/mmcblk0p5
/dev/block/mmcblk0p6
/dev/block/mmcblk0p7
/dev/block/mmcblk0p8
/dev/block/mmcblk0p9
/dev/block/mmcblk0rpmb


What is the normal amount of mmcblk devices? I'm having problems booting and I'm wondering if this kind of formatting is normal or not?



When I boot up under TWRP, and adb in. After I run mount -a, I get



/dev/block/mmcblk0p19 on /cache type ext4 (rw,seclabel,relatime,data=ordered)
/dev/block/mmcblk0p21 on /data type ext4 (rw,seclabel,relatime,data=ordered)
/dev/block/mmcblk0p20 on /system type ext4 (rw,seclabel,relatime)
/dev/block/mmcblk0p16 on /preload type ext4 (rw,seclabel,relatime,data=ordered)


That only explains four of them though.










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    up vote
    2
    down vote

    favorite












    Why so many mmcblk devices?



    /dev/block/mmcblk0
    /dev/block/mmcblk0boot0
    /dev/block/mmcblk0boot1
    /dev/block/mmcblk0p1
    /dev/block/mmcblk0p10
    /dev/block/mmcblk0p11
    /dev/block/mmcblk0p12
    /dev/block/mmcblk0p13
    /dev/block/mmcblk0p14
    /dev/block/mmcblk0p15
    /dev/block/mmcblk0p16
    /dev/block/mmcblk0p17
    /dev/block/mmcblk0p18
    /dev/block/mmcblk0p19
    /dev/block/mmcblk0p2
    /dev/block/mmcblk0p20
    /dev/block/mmcblk0p21
    /dev/block/mmcblk0p3
    /dev/block/mmcblk0p4
    /dev/block/mmcblk0p5
    /dev/block/mmcblk0p6
    /dev/block/mmcblk0p7
    /dev/block/mmcblk0p8
    /dev/block/mmcblk0p9
    /dev/block/mmcblk0rpmb


    What is the normal amount of mmcblk devices? I'm having problems booting and I'm wondering if this kind of formatting is normal or not?



    When I boot up under TWRP, and adb in. After I run mount -a, I get



    /dev/block/mmcblk0p19 on /cache type ext4 (rw,seclabel,relatime,data=ordered)
    /dev/block/mmcblk0p21 on /data type ext4 (rw,seclabel,relatime,data=ordered)
    /dev/block/mmcblk0p20 on /system type ext4 (rw,seclabel,relatime)
    /dev/block/mmcblk0p16 on /preload type ext4 (rw,seclabel,relatime,data=ordered)


    That only explains four of them though.










    share|improve this question


























      up vote
      2
      down vote

      favorite









      up vote
      2
      down vote

      favorite











      Why so many mmcblk devices?



      /dev/block/mmcblk0
      /dev/block/mmcblk0boot0
      /dev/block/mmcblk0boot1
      /dev/block/mmcblk0p1
      /dev/block/mmcblk0p10
      /dev/block/mmcblk0p11
      /dev/block/mmcblk0p12
      /dev/block/mmcblk0p13
      /dev/block/mmcblk0p14
      /dev/block/mmcblk0p15
      /dev/block/mmcblk0p16
      /dev/block/mmcblk0p17
      /dev/block/mmcblk0p18
      /dev/block/mmcblk0p19
      /dev/block/mmcblk0p2
      /dev/block/mmcblk0p20
      /dev/block/mmcblk0p21
      /dev/block/mmcblk0p3
      /dev/block/mmcblk0p4
      /dev/block/mmcblk0p5
      /dev/block/mmcblk0p6
      /dev/block/mmcblk0p7
      /dev/block/mmcblk0p8
      /dev/block/mmcblk0p9
      /dev/block/mmcblk0rpmb


      What is the normal amount of mmcblk devices? I'm having problems booting and I'm wondering if this kind of formatting is normal or not?



      When I boot up under TWRP, and adb in. After I run mount -a, I get



      /dev/block/mmcblk0p19 on /cache type ext4 (rw,seclabel,relatime,data=ordered)
      /dev/block/mmcblk0p21 on /data type ext4 (rw,seclabel,relatime,data=ordered)
      /dev/block/mmcblk0p20 on /system type ext4 (rw,seclabel,relatime)
      /dev/block/mmcblk0p16 on /preload type ext4 (rw,seclabel,relatime,data=ordered)


      That only explains four of them though.










      share|improve this question















      Why so many mmcblk devices?



      /dev/block/mmcblk0
      /dev/block/mmcblk0boot0
      /dev/block/mmcblk0boot1
      /dev/block/mmcblk0p1
      /dev/block/mmcblk0p10
      /dev/block/mmcblk0p11
      /dev/block/mmcblk0p12
      /dev/block/mmcblk0p13
      /dev/block/mmcblk0p14
      /dev/block/mmcblk0p15
      /dev/block/mmcblk0p16
      /dev/block/mmcblk0p17
      /dev/block/mmcblk0p18
      /dev/block/mmcblk0p19
      /dev/block/mmcblk0p2
      /dev/block/mmcblk0p20
      /dev/block/mmcblk0p21
      /dev/block/mmcblk0p3
      /dev/block/mmcblk0p4
      /dev/block/mmcblk0p5
      /dev/block/mmcblk0p6
      /dev/block/mmcblk0p7
      /dev/block/mmcblk0p8
      /dev/block/mmcblk0p9
      /dev/block/mmcblk0rpmb


      What is the normal amount of mmcblk devices? I'm having problems booting and I'm wondering if this kind of formatting is normal or not?



      When I boot up under TWRP, and adb in. After I run mount -a, I get



      /dev/block/mmcblk0p19 on /cache type ext4 (rw,seclabel,relatime,data=ordered)
      /dev/block/mmcblk0p21 on /data type ext4 (rw,seclabel,relatime,data=ordered)
      /dev/block/mmcblk0p20 on /system type ext4 (rw,seclabel,relatime)
      /dev/block/mmcblk0p16 on /preload type ext4 (rw,seclabel,relatime,data=ordered)


      That only explains four of them though.







      samsung partitions






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited Dec 4 at 5:43

























      asked Dec 4 at 5:38









      Evan Carroll

      1,845112857




      1,845112857






















          1 Answer
          1






          active

          oldest

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          up vote
          6
          down vote



          accepted










          There is nothing abnormal in this case. They is only one device in the first preformatted text, which is /dev/block/mmcblk0 (just like /dev/sda in Linux distros). The rest are the partitions within that device (akin to /dev/sda1, /dev/sda2 and so on).



          There is no normal limit, not that I came across, for how many partitions a device can have. It depends upon how developers want to design and provide a functionality. E.g. earlier, there used to be one system and boot partition. But recent Android versions started a new normal of setting up additional boot and system partitions for fail-safe measures.



          Also, mount command only shows the partition which are mounted under /. Some partitions are never needed to be mounted, such as ones concerning bootloader, so you won't see them in mount's output.






          share|improve this answer





















          • Great answer, I'll keep digging.
            – Evan Carroll
            Dec 4 at 6:00










          • @EvanCarroll thanks! I think you would find this Q&A helpful. See android.stackexchange.com/q/92565/96277
            – Firelord
            Dec 4 at 6:03






          • 2




            +1. My device mia1 reports 64!
            – beeshyams
            Dec 4 at 6:06











          Your Answer








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          up vote
          6
          down vote



          accepted










          There is nothing abnormal in this case. They is only one device in the first preformatted text, which is /dev/block/mmcblk0 (just like /dev/sda in Linux distros). The rest are the partitions within that device (akin to /dev/sda1, /dev/sda2 and so on).



          There is no normal limit, not that I came across, for how many partitions a device can have. It depends upon how developers want to design and provide a functionality. E.g. earlier, there used to be one system and boot partition. But recent Android versions started a new normal of setting up additional boot and system partitions for fail-safe measures.



          Also, mount command only shows the partition which are mounted under /. Some partitions are never needed to be mounted, such as ones concerning bootloader, so you won't see them in mount's output.






          share|improve this answer





















          • Great answer, I'll keep digging.
            – Evan Carroll
            Dec 4 at 6:00










          • @EvanCarroll thanks! I think you would find this Q&A helpful. See android.stackexchange.com/q/92565/96277
            – Firelord
            Dec 4 at 6:03






          • 2




            +1. My device mia1 reports 64!
            – beeshyams
            Dec 4 at 6:06















          up vote
          6
          down vote



          accepted










          There is nothing abnormal in this case. They is only one device in the first preformatted text, which is /dev/block/mmcblk0 (just like /dev/sda in Linux distros). The rest are the partitions within that device (akin to /dev/sda1, /dev/sda2 and so on).



          There is no normal limit, not that I came across, for how many partitions a device can have. It depends upon how developers want to design and provide a functionality. E.g. earlier, there used to be one system and boot partition. But recent Android versions started a new normal of setting up additional boot and system partitions for fail-safe measures.



          Also, mount command only shows the partition which are mounted under /. Some partitions are never needed to be mounted, such as ones concerning bootloader, so you won't see them in mount's output.






          share|improve this answer





















          • Great answer, I'll keep digging.
            – Evan Carroll
            Dec 4 at 6:00










          • @EvanCarroll thanks! I think you would find this Q&A helpful. See android.stackexchange.com/q/92565/96277
            – Firelord
            Dec 4 at 6:03






          • 2




            +1. My device mia1 reports 64!
            – beeshyams
            Dec 4 at 6:06













          up vote
          6
          down vote



          accepted







          up vote
          6
          down vote



          accepted






          There is nothing abnormal in this case. They is only one device in the first preformatted text, which is /dev/block/mmcblk0 (just like /dev/sda in Linux distros). The rest are the partitions within that device (akin to /dev/sda1, /dev/sda2 and so on).



          There is no normal limit, not that I came across, for how many partitions a device can have. It depends upon how developers want to design and provide a functionality. E.g. earlier, there used to be one system and boot partition. But recent Android versions started a new normal of setting up additional boot and system partitions for fail-safe measures.



          Also, mount command only shows the partition which are mounted under /. Some partitions are never needed to be mounted, such as ones concerning bootloader, so you won't see them in mount's output.






          share|improve this answer












          There is nothing abnormal in this case. They is only one device in the first preformatted text, which is /dev/block/mmcblk0 (just like /dev/sda in Linux distros). The rest are the partitions within that device (akin to /dev/sda1, /dev/sda2 and so on).



          There is no normal limit, not that I came across, for how many partitions a device can have. It depends upon how developers want to design and provide a functionality. E.g. earlier, there used to be one system and boot partition. But recent Android versions started a new normal of setting up additional boot and system partitions for fail-safe measures.



          Also, mount command only shows the partition which are mounted under /. Some partitions are never needed to be mounted, such as ones concerning bootloader, so you won't see them in mount's output.







          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered Dec 4 at 5:58









          Firelord

          17k1171178




          17k1171178












          • Great answer, I'll keep digging.
            – Evan Carroll
            Dec 4 at 6:00










          • @EvanCarroll thanks! I think you would find this Q&A helpful. See android.stackexchange.com/q/92565/96277
            – Firelord
            Dec 4 at 6:03






          • 2




            +1. My device mia1 reports 64!
            – beeshyams
            Dec 4 at 6:06


















          • Great answer, I'll keep digging.
            – Evan Carroll
            Dec 4 at 6:00










          • @EvanCarroll thanks! I think you would find this Q&A helpful. See android.stackexchange.com/q/92565/96277
            – Firelord
            Dec 4 at 6:03






          • 2




            +1. My device mia1 reports 64!
            – beeshyams
            Dec 4 at 6:06
















          Great answer, I'll keep digging.
          – Evan Carroll
          Dec 4 at 6:00




          Great answer, I'll keep digging.
          – Evan Carroll
          Dec 4 at 6:00












          @EvanCarroll thanks! I think you would find this Q&A helpful. See android.stackexchange.com/q/92565/96277
          – Firelord
          Dec 4 at 6:03




          @EvanCarroll thanks! I think you would find this Q&A helpful. See android.stackexchange.com/q/92565/96277
          – Firelord
          Dec 4 at 6:03




          2




          2




          +1. My device mia1 reports 64!
          – beeshyams
          Dec 4 at 6:06




          +1. My device mia1 reports 64!
          – beeshyams
          Dec 4 at 6:06


















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