Difference between revisions of "Format SSD MMC"
From ElphelWiki
| Line 12: | Line 12: | ||
==<font color="blue">SSD or USB</font>== | ==<font color="blue">SSD or USB</font>== | ||
| − | === | + | ===camera=== |
* check the SSD is already partitioned: | * check the SSD is already partitioned: | ||
$ cat /proc/partitions | $ cat /proc/partitions | ||
| Line 21: | Line 21: | ||
* for '''fast recording''' | * for '''fast recording''' | ||
** Do not make a file system on the partition | ** Do not make a file system on the partition | ||
| + | |||
| + | ===PC=== | ||
| + | The same as above | ||
==<font color="blue">MMC</font>== | ==<font color="blue">MMC</font>== | ||
| − | + | ===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 /. | mounts /dev/mmcblk0p2 (EXT4) as /. | ||
* check boot mode: | * check boot mode: | ||
| Line 32: | Line 35: | ||
* manage partitions: | * manage partitions: | ||
$ fdisk /dev/mmcblk0 | $ fdisk /dev/mmcblk0 | ||
| − | * mkfs | + | * 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 | ||
==<font color="blue">'Erase' a file system from a partition</font>== | ==<font color="blue">'Erase' a file system from a partition</font>== | ||
| Line 52: | Line 60: | ||
** the script is used to create a bootable MMC from a PC (the camera doesn't have ''parted'' and ''kpartx'' installed) | ** 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''' | ** it has examples of using '''dd''', '''parted''', '''mkfs''', '''kpartx''' | ||
| + | * [[Sd_boot_rootfs MMC boot]] - prepare a bootable μSD card and boot | ||
[[Category:393]] | [[Category:393]] | ||
Revision as of 11:52, 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
- check the SSD 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
- Sd_boot_rootfs MMC boot - prepare a bootable μSD card and boot
