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I'm wondering if I flash a custom ROM onto my Samsung Galaxy Nexus device, will it erase all my data (musics, pictures, etc.) due to its memory singularity?

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Flashing a CustomROM (usually any ROM different to the one you're currently running) requires you to do a complete Wipe (well, at least it is strongly recommended for stability reasons) -- so the answer is probably: Yes. Data on an external SD card usually is not affected -- but as far as I remember, the GN has no such thing.

You might wish to consult the following Q&As for more information:

EDIT:

Just to be more clear: Data on (external|internal) SD-Card (the Nexus uses an internal eMMC instead of the external SD, if I'm correct) -- that is the place where you store your photos, videos, music files, etc. -- are not affected by the wipe. Just all "internal memory" -- i.e. the apps you installed, and all settings plus app data -- will be erased.

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  • You will not lose your SD card partition with a normal wipe (on Nexus S, I have no reason to assume CWM would change that much for GNex). It would be silly because it would nuke the backup you just made.
    – Broam
    Commented Aug 2, 2012 at 15:48
  • @Broam Nexus uses internal SD card instead of external, correct? So that's where you place your files (photos, videos, music...)? Then you are correct: That partition won't be affected. I will edit my answer to make that clear. Still, all user data (apps you installed, their data, etc.) are gone.
    – Izzy
    Commented Aug 2, 2012 at 15:57
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My understanding is that you'll need to unlock your bootloader in order to flash, and unlocking your bootloader will indeed wipe everything.

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    I've unlocked the bootloader which is a onetime only action. But flashing ROMs could happen many times.
    – 2hamed
    Commented Aug 2, 2012 at 15:09

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