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02-07-2013, 03:51 PM,
AndroidGuru Offline

  • Dec 2012
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MTP mounts vs USB storage - restrictions

Just got a nexus 4, and tried to copy files from my nexus one to it. Copying the N1 SD data to my linux box was a breeze, but the N4 doesn't offer simple mounting. Shows up as a USB Camera, with only access to DCIM. I was able to find and use mtpfs to mount the device, but even that has some serious limitations.

The software on the phone's end seems to make some decisions for you. I tried copying a mix of files from the N1's Ringtones directory to a Ringtones directory on the N4, and the N4 decided that mp3's belong in the Music directory, etc. I couldn't control where stuff went. Interesting, some flv files that were there went to Ringones, but not the mp3's. At first I thought the mp3's weren't copied at all. I was able to fool this logic by copying to Download on the N4. Anyway, not sure I like the phone making these decisions.

The mtpfs mount didn't allow me to preserve the timestamps on the copied files. I copied a bunch of pictures (cp -p) from the N1's DCIM/Camera folder to the N4's. They all came over with the current date/time. I can see where it'd be a good idea not to allow a usb mount to set the owner or permissions for a file, but the timestamp? Is there a way around this, or is this just a shortcoming of the linux mtpfs implementation?
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03-28-2013, 02:40 PM,
Android Expert Offline
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  • Jan 2013
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RE: MTP mounts vs USB storage - restrictions

For this reason you've switched to the app called FolderSync and set it up with your own SSH server. It is absolutely a bliss, because you've never had to worry about the sync again.

Every file I want is uploaded to your server, new files that I drop on the server appear on the device without your intervention.

(This post was last modified: 03-28-2013, 02:46 PM by Android Expert.)
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06-27-2013, 04:08 PM,
seeyaa Offline
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  • Jun 2013
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RE: MTP mounts vs USB storage - restrictions

Buy a Galaxy S2. It has dedicated partition for internal sdcard, so allows you to use Mass Storage Mode, which is not the case for newer devices (S3 and up).

Another possible option, is to transfer files via FTP.
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