1. Summary

I can't set primary, not logical partition in my SD Card.

After my attempts, I can't write anything to SD Card.

2. Hardware and software

2.1. Smartphone

  1. ARK Benefit S401,
  2. Android 5.1.1,
  3. CyanogenMod 12.1 ROM,
  4. Rooted, Busybox installed,
  5. TWRP Recovery,
  6. Successful worked with another and non-mounted SD Cards.

2.2. PC

  1. Windows 10 Enterprise LTSB EN,
  2. MiniTool Partition Wizard Home Edition 10.0,
  3. EaseUS Partition Master (Free) 12.8.

2.3. SD Card

  1. OSMR 8 GB (7,5 de-facto),
  2. 10 class,
  3. Error checking:

    Error checking

  4. Surface Test:


  5. I have card reader as well.

3. Steps to reproduce

3.1. Reason

I have 1,7 GB User Partition in my phone, it's not enough for me. I want to move my apk + dex + lib files to SD Card. I read, that I need to use Link2SD and to create new primary partition in my SD Card.

3.2. Partition creating

I create backup all my MicroSD data.

I try to create partitions, use these instructions:

  1. How to use Link2SD App for Partition SD Card — Full Guide,
  2. [TUT]How to Create Partition in SD card/MicroSD for Windows user.

Operations Ext4 Apply pending

4. Result

  1. I select primary, but in result I get logical, not primary partition:

    Not primary

  2. I can't move my apk + lib + dex to SD Card:

    Second partition not found


  3. After my operations I can't to make screenshots, download applications to SD Card. I probably can't write any data to SD card. I get errors:

    Can't take screenshot due to limited storage space, or it isn't allowed by the app or your organization

    Mod.apk_download: open failed: EROFS (Read-only file system)

5. Not helped

  1. I create logical, not primary partition for 2,5 GB again.
  2. I create ext2 and ext3 partitions instead of ext4.
  3. I try partition recovery:




6. Formatting

1. SD Memory Card Formation

I try format my SDCard use SD Memory Card Formation. Quick and overwrite formatting failed.

Quick Overwrite

2. Diskpart

I try to format my MicroSD use diskpart:

C:\System Volume Information>diskpart

Microsoft DiskPart version 10.0.14393.0

Copyright (C) 1999-2013 Microsoft Corporation.
On computer: DESKTOP-EEOT0TN

DISKPART> list disk

  Disk ###  Status         Size     Free     Dyn  Gpt
  --------  -------------  -------  -------  ---  ---
  Disk 0    Online          931 GB  4096 KB
  Disk 1    Online         7681 MB      0 B

DISKPART> select disk 1

Disk 1 is now the selected disk.

DISKPART> attributes disk clear readonly

Disk attributes cleared successfully.

DISKPART> select partition 1

Partition 1 is now the selected partition.

DISKPART> active

DiskPart marked the current partition as active.

DISKPART> format fs=fat32

    0 percent completed

DiskPart has encountered an error: The parameter is incorrect.
See the System Event Log for more information.


Leaving DiskPart...

3. chkdsk

chkdsk g: /f /r
The type of the file system is FAT32.
Volume Serial Number is 0352-6F30
Windows is verifying files and folders...
File and folder verification is complete.
Windows is verifying free space...
Free space verification is complete.

Windows has scanned the file system and found no problems.
No further action is required.
    5,231,600 KB total disk space.
            4 KB in 2 hidden files.
        1,236 KB in 295 folders.
    1,902,568 KB in 1,076 files.
    3,327,788 KB are available.

        4,096 bytes in each allocation unit.
    1,307,900 total allocation units on disk.
      831,947 allocation units available on disk.
Cannot write boot sector.

4. HDD Low Level Format Tool

After these actions nothing has changed.



7. Do not offer

  1. Please do not suggest me to buy new telephone/SD Card/PC.
  • I would have tried to dd if=/dev/zero of=/dev/sdX bs=1M count=1 to clear out any traces of corrupted partition info that may cause lesser tools to fail format the card. In case dd fails, you can be pretty sure to have hardware problem with the card. In addition, the S in the SD card name refers to "Secure" - SD cards can be put to permanent read only state (either full storage space or partially) and if some misbehaving software has done that, there's no way to undo. In practice, that belongs to "broken hardware" case, too. Commented Jul 10, 2019 at 12:19

2 Answers 2


1. Answer

Unfortunately, in this case you need buy a new SD Card.

2. Argumentation

Если у вас не записываются новые данные на карту, а старые после удаления появляются вновь, и форматирование не помогает — карта труп, и восстановить её не удастся!

Translate on English:


  1. New data don't write to SD Card (4.3 item of my question)
  2. Old data show again
  3. Formatting doesn't help (6 item)


  • You lost your SD Card.

I could not refute this in my case.


To be clear. You're not going to move Dalvik Cache to sdcard because the Dalvik Virtual Machine is set to prepare application classes cache to the data partition that claims your internal storage. You can move the app files to sd because they are in the user end but the dalvik cache is managed from the system end by DVM. You can create the partition but having system apps' classes there, there ain't a way. Or did you just mean apps to sd? Which is possible?

  • Thanks for the answer. I read Link2SD FAQ: // Native apps2sd — this method moves apk + lib files on Android 2.3+ // Link2SD — Link2SD moves apk + dex + lib files of the application to the second partition and creates symbolic links in the original locations on internal storage. // I want to move to my SD Card apk + dex + lib files. Commented Dec 12, 2017 at 10:05
  • 1
    I got you now what you meant
    – Thally Ace
    Commented Dec 12, 2017 at 10:48
  • I edit the question, based on your answer. Thanks. Commented Dec 12, 2017 at 10:56
  • Okay. It's now more clearer. I see you're using computer, is there any other way to have this done locally on phone?
    – Thally Ace
    Commented Dec 12, 2017 at 11:00
  • Now I can't download any apps to my phone, see 4.3 item( . Commented Dec 12, 2017 at 11:05

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