There seem to be very few IDE HDDs in the 40GB - 320GB range that can't be locked. I've yet to find any WD, Seagate or Maxtor 120GB one which is incompatible and, in fact, SATA ones should be even more compatible as locking is generally supported by most modern HDDs.
Problems with a SATA HDDs are more likely to be caused by the SATA > IDE adapter being used rather than the HDD itself.
