Difference between revisions of "Format SSD MMC"
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| Line 2: | Line 2: | ||
Help tips for formatting: | Help tips for formatting: | ||
* SSD (internal or external) | * SSD (internal or external) | ||
| − | * MMC (& | + | * MMC (μSD card - normal or recovery) |
* USB drive | * USB drive | ||
| Line 13: | Line 13: | ||
==<font color="blue">SSD or USB</font>== | ==<font color="blue">SSD or USB</font>== | ||
===camera=== | ===camera=== | ||
| − | * | + | * (not needed for USB) Check if SSD is connected to the camera: |
| + | ** The default connection is ''camera <=> internal SSD'' | ||
| + | ** For external drive set: ''camera <=> external SSD'' and power on the drive. | ||
| + | ** [[Sata_multiplexer_10389| '''More info''']] | ||
| + | * Find out the device name: | ||
| + | $ dmesg | ||
| + | * Check if it is already partitioned: | ||
$ cat /proc/partitions | $ cat /proc/partitions | ||
* manage partitions: | * manage partitions: | ||
| Line 22: | Line 28: | ||
** 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 except: |
| + | * For internal SSD the connection should be set to ''pc <=> internal SSD'' | ||
==<font color="blue">MMC</font>== | ==<font color="blue">MMC</font>== | ||
| Line 38: | Line 45: | ||
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 | ||
| + | |||
| + | |||
==<font color="blue">'Erase' a file system from a partition</font>== | ==<font color="blue">'Erase' a file system from a partition</font>== | ||
| Line 55: | Line 64: | ||
* 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 | ||
| + | |||
| + | |||
==<font color="blue">Useful links</font>== | ==<font color="blue">Useful links</font>== | ||
| − | * [https:// | + | * [https://git.elphel.com/Elphel/elphel-tools-update git: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) | ** 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''' | ||
Latest revision as of 10:23, 26 June 2017
Contents
About
Help tips for formatting:
- SSD (internal or external)
- MMC (μSD 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
- (not needed for USB) Check if SSD is connected to the camera:
- The default connection is camera <=> internal SSD
- For external drive set: camera <=> external SSD and power on the drive.
- More info
- 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 except:
- For internal SSD the connection should be set to pc <=> internal SSD
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
- git: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
