format
Command Function
This command is used for disk formatting.
Syntax
format <devinodename_> <sectors> <option> [label]
Parameters
Table 1 Parameter description
| Parameter | Description |
|---|---|
| dev_inodename | Specifies the device name. |
| sectors | Specifies the size of the allocated memory unit or sector. The value must be 0 or a power of 2. The value 0 means to leave this parameter blank. For FAT32, the maximum value is 128. If the parameter is set to 0, a proper cluster size is automatically selected. The available cluster size range varies depending on the partition size. If the cluster size is incorrectly specified, the formatting may fail. |
| option | Specifies the file system type. The options are as follows: - 0x01: FMT_FAT - 0x02: FMT_FAT32 - 0x07: FMT_ANY - 0x08: FMT_ERASE (USB does not support this option.) If an invalid value is specified, the system automatically selects the formatting mode. If the low-level formatting bit is 1 during the formatting of a USB flash drive, an error message is printed. |
| label | Specifies the volume label name. This parameter is optional, and the value is a string. If null is specified for this parameter, the previously set volume label name is cleared. |
Usage Guidelines
-
The format command is used for disk formatting. You can find the device name in the dev directory. A storage card must be installed before the formatting.
-
The format command can be used to format the USB flash drive, SD card, and MMC, but not the NAND flash or NOR flash.
-
An invalid sectors value may cause exceptions.
Example
Run format /dev/mmcblk0 128 2.
Output
Format an MMC.
OHOS # format /dev/mmcblk1 128 2
Format to FAT32, 128 sectors per cluster.
format /dev/mmcblk1 Success