Extend
DiskPart
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Syntax: extend [size=n] [disk=n] [noerr]
Extends the volume with focus into the next contiguous unallocated space. For basic volumes, the unallocated space must be on the same disk as, and must follow (have a higher sector offset number than) the partition with focus. A dynamic, simple, or spanned volume can be extended to any empty space on any dynamic disk. By using this command, you can extend an existing volume into newly created space.
If the partition was previously formatted with the NTFS file system,
the file system is automatically extended to occupy the larger
partition. No data loss occurs. If the partition was previously
formatted with any file system format other than NTFS, the command
fails with no change to the partition.
You cannot extend the current system or boot partitions.
size= n
Specifies the amount of space, in megabytes (MB), to add to the
current partition. If you do not specify a size, the disk is
extended to take up all of the next contiguous unallocated space.
disk= n
Specifies the dynamic disk on which to extend the volume. An amount
of space equal to size=n is allocated on the disk.
If no disk is specified, the volume is extended on the current disk.
noerr
For scripting only. When an error occurs, specifies that DiskPart
continues to process commands as if the error did not occur. Without
the noerr parameter, an error causes DiskPart to
exit with an error code.