Checking that no-one is using this disk right now ...
BLKRRPART: Device or resource busy

This disk is currently in use - repartitioning is probably a bad idea.
Umount all file systems, and swapoff all swap partitions on this disk.
Use the --no-reread flag to suppress this check.

Disk /dev/sda: 121601 cylinders, 255 heads, 63 sectors/track
Warning: extended partition does not start at a cylinder boundary.
DOS and Linux will interpret the contents differently.
Old situation:
Units = sectors of 512 bytes, counting from 0

   Device Boot    Start       End   #sectors  Id  System
/dev/sda1   *      2048    206847     204800   7  HPFS/NTFS/exFAT
/dev/sda2        206848 317396204  317189357   7  HPFS/NTFS/exFAT
/dev/sda3     317412264 1126381409  808969146   7  HPFS/NTFS/exFAT
/dev/sda4     1126381566 1325598719  199217154   5  Extended
/dev/sda5   * 1126381568 1321693183  195311616  83  Linux
/dev/sda6     1321695232 1325598719    3903488  82  Linux swap / Solaris

sfdisk: unrecognized input: extended partition does not start at a cylinder boundary.