Quote from Changelog:

hdparm-9.50:
	- minor fixes for sanitize device stuff.
hdparm-9.49:
	- add ACS-3 overprovisioning support, courtesy of Intel.
	- fix bug in display of security section and use updated erase-time values from ACS-3, courtesy of Patrick Higgins.
	- increase timeout on fwdownload to 2 minutes, courtesy of Rusy Carruth.
	- fix bugs from devslp patch.