Difference between revisions of "Format SSD MMC"
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* '''mkfs.vfat''' - create filesystem | * '''mkfs.vfat''' - create filesystem | ||
* '''dd''' - clean filesystem from the partition for '''fast recording''' | * '''dd''' - clean filesystem from the partition for '''fast recording''' | ||
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==<font color="blue">SSD or USB</font>== | ==<font color="blue">SSD or USB</font>== | ||
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** Do not make a file system on the partition | ** Do not make a file system on the partition | ||
| − | === | + | ===pc=== |
The same as above | The same as above | ||
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==<font color="blue">MMC</font>== | ==<font color="blue">MMC</font>== | ||
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mkfs.ext4 /dev/mmcblk0pX | mkfs.ext4 /dev/mmcblk0pX | ||
| − | === | + | ===pc=== |
* Same as above except the MMC might be detected as /dev/sdX | * Same as above except the MMC might be detected as /dev/sdX | ||
* If MMC is for boot the partition table type must be '''msdos''', not gpt | * If MMC is for boot the partition table type must be '''msdos''', not gpt | ||
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==<font color="blue">'Erase' a file system from a partition</font>== | ==<font color="blue">'Erase' a file system from a partition</font>== | ||
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* To erase the drive's partition table (better use '''fdisk'''): | * To erase the drive's partition table (better use '''fdisk'''): | ||
$ dd if=/dev/zero of=/dev/sda bs=512 count=2 | $ dd if=/dev/zero of=/dev/sda bs=512 count=2 | ||
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==<font color="blue">Useful links</font>== | ==<font color="blue">Useful links</font>== | ||
Revision as of 11:56, 29 December 2016
Contents
About
Help tips for formatting:
- SSD (internal or external)
- MMC (&muSD card - normal or recovery)
- USB drive
Can be done either from the camera or PC, the required programs are:
- fdisk - format into partitions
- mkfs.ext4 - create filesystem
- mkfs.vfat - create filesystem
- dd - clean filesystem from the partition for fast recording
SSD or USB
camera
- Find out the device name:
$ dmesg
- Check if it is already partitioned:
$ cat /proc/partitions
- manage partitions:
$ fdisk /dev/sda
- format a partition for file storage:
$ mkfs.ext4 /dev/sda1
- for fast recording
- Do not make a file system on the partition
pc
The same as above
MMC
camera
Make sure the camera is not boot from the MMC - in MMC boot by default the camera gets the boot files from /dev/mmcblk0p1 (FAT32) and mounts /dev/mmcblk0p2 (EXT4) as /.
- check boot mode:
$ mount | grep " / "
- check existing paritions:
$ cat /proc/partitions
- manage partitions:
$ fdisk /dev/mmcblk0
- format a partition for file storage:
mkfs.ext4 /dev/mmcblk0pX
pc
- Same as above except the MMC might be detected as /dev/sdX
- If MMC is for boot the partition table type must be msdos, not gpt
'Erase' a file system from a partition
Sometimes there is a need to this:
- if the drive was partitioned several times and the old file system journal starts from a location of a new partition - the file system will surely show up.
- by accident
Examples:
- Use dd:
- 'Erase' a filesystem from /dev/sda1
$ dd if=/dev/zero of=/dev/sda bs=1MB count=1 seek=1
- 'Erase' a filesystem on /dev/sda2, if /dev/sda1 size is SIZE MB:
$ dd if=/dev/zero of=/dev/sda bs=1MB count=1 seek=SIZE
- To erase the drive's partition table (better use fdisk):
$ dd if=/dev/zero of=/dev/sda bs=512 count=2
Useful links
- github:elphel-tools-update - write_bootable_mmc.py
- the script is used to create a bootable MMC from a PC (the camera doesn't have parted and kpartx installed)
- it has examples of using dd, parted, mkfs, kpartx
- MMC boot
- prepare a bootable μSD card and boot
