Create Partition
DiskPart
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Syntax: create partition extended [size=n] [offset=n] [noerr]
Creates an extended partition on the current drive. After the
partition has been created, the focus automatically shifts to the
new partition. Only one extended partition can be created per disk.
This command fails if you attempt to create an extended partition
within another extended partition. You must create an extended
partition before you can create logical drives.
size= n
Specifies the size of the extended partition in megabytes (MB). If
no size is given, then the partition continues until there is no
more free space in the region. The size is cylinder snapped; that
is, the size is rounded to the closest cylinder boundary. For
example, if you specify a size of 500 MB, the partition size rounds
up to 504 MB.
offset= n
Applies to master boot record (MBR) disks only. Specifies the byte
offset at which to create the extended partition. If no offset is
given, the partition starts at the beginning of the first free space
on the disk. The offset is cylinder snapped; that is, the offset is
rounded to the closest cylinder boundary. For example, if you
specify an offset that is 27 MB and the cylinder size is 8 MB, the
offset is rounded to the 24-MB boundary.
noerr
For scripting only. When an error is encountered, 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.