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Recommended file system type & partitioning scheme for the microSD card? [answered]

asked 2013-12-26 15:09:27 +0300

NikosAlexandris gravatar image

updated 2014-12-05 22:38:00 +0300

pulsar gravatar image

File System Support

  1. First, which file systems are supported by SailfishOS? -- Has been answered!

  2. Recommended file system Depending on usage scenarios, what is the recommended file system type based on which to format the microSD card? Under usage scenarios I think of what is the recommended all-around-OSes interoperable file system. Another would be the recommended file system for working with nix-like OSes only (and performance or data integrity, etc.). Any recommendations? -- No answer yet, waiting easy support/integration for more filesystems.*

  3. Partitions Only one partition or more? -- Has been answered!

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The question has been closed for the following reason "the question is answered, an answer was accepted" by olf
close date 2018-03-05 17:10:07.372995



Looking at the current SD card mounting script, it seems to support mounting only the first partition on the SD card at the moment (and also a directly formatted SD card without partitions ?).

MartinK ( 2013-12-26 15:13:32 +0300 )edit

@MartinK Thank you, I can't upvote your comment immediately (for today, votes all spent :-)).

NikosAlexandris ( 2013-12-26 15:17:21 +0300 )edit

I see this is a popular question in smart-phone related sites in the web... :-!

NikosAlexandris ( 2013-12-26 15:18:59 +0300 )edit

For the record, I'm using EXT4 on the card at the moment and everything seems to be fine so far. :)

MartinK ( 2013-12-26 15:24:06 +0300 )edit

Related discussion "Jolla SD card" in It covers which cards, which file-systems: msg 1900

NikosAlexandris ( 2013-12-26 15:27:48 +0300 )edit

2 Answers

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answered 2013-12-26 15:35:06 +0300

Kontio gravatar image

updated 2013-12-26 15:59:38 +0300

Currently just the first found partition is auto mounted and sd cards w/o partition table.

Currently just vFAT/FAT32 is supported, other file systems fail to be mounted due to the mount options given which just make sense for vfat mounts. (But can be mounted by hand if developer mode is enabled).

It looks like that windows native tools do not allow to format huge (>= 64GB?) sd cards with FAT32 and forces exFAT. Also newer sd cards (>= 64GB?) are now a days more often pre formatted with exFAT. Formatting the sd-card should be done under Linux with mkfs.vfat. I'm not aware of a Windows tool which allows it? Not sure about OS X.

NOTICE: Reformatting the sd card with an other supported file system deletes all files on the sd card irrecoverable! So before doing that, make a back up of the files on the sd card.

see also and

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+1 for the NOTICE

NikosAlexandris ( 2013-12-26 15:42:07 +0300 )edit

Confirmed, ext4 wont work "out of the box". vFAT does. Since only two file systems are supported currently out-of-the-box, I am accepting this answer. Yet, I won't close it as it will be still valid when more FSes will be supported.

NikosAlexandris ( 2013-12-26 23:41:07 +0300 )edit

answered 2018-03-05 17:08:52 +0300

olf gravatar image

updated 2018-03-05 17:17:18 +0300

This question and all its sub-questions are answered in "[How-to] Creating partitions on SD-card, optionally encrypted".

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Asked: 2013-12-26 15:09:27 +0300

Seen: 3,918 times

Last updated: Mar 05 '18