Most recent hard disks do include S.M.A.R.T. support. You might find interesting to read the "What is S.M.A.R.T. and how can we use it to avoid data disaster?" article. S.M.A.R.T. can even report the temperature for your hard disk. If your disk controller, and its related drivers, allow it, SpeedFan can almost always access and report reliability data from any hard disk manufactured since 1995.
SpeedFan properly accesses the temperature sensor available in the following hard disks:

Manufacturers EXCELSTOR    17 FUJITSU    122 HITACHI    189 HP Compaq    3 IBM    53 MAXTOR    163 MDT    14 SAMSUNG    135 SEAGATE    297 SILICON IMAGE    1 TOSHIBA    67 WESTERN DIGITAL    1026

Hard disks from HITACHI that include a temperature sensor Manufacturer Model Size Notes HITACHI HCS721616PLAT80 165GB HITACHI HCS721680PLAT80 82.3GB HITACHI HCS725025VLA380 250GB HITACHI HCS725050VLA380 500GB HITACHI HDP725016GLA380 160GB HITACHI HDP725016GLAT80 160GB HITACHI HDP725025GLA380 250GB HITACHI HDP725025GLAT80 250GB HITACHI HDP725032GLA360 320GB HITACHI HDP725032GLA380 320GB HITACHI HDP725032GLAT80 320GB HITACHI HDP725040GLA360 400GB HITACHI HDP725050GLA360 500GB HITACHI HDP725050GLA380 500GB HITACHI HDP725050GLAT80 500GB HITACHI HDS721010KLA330 1000GB HITACHI HDS721075KLA330 750GB HITACHI HDS721612PLA380 124GB HITACHI HDS721612PLAT80 124GB HITACHI HDS721616PLA320 160GB HITACHI HDS721616PLA380 165GB HITACHI HDS721616PLAT80 165GB HITACHI HDS721680PLA380 82.3GB HITACHI HDS721680PLAT80 82.3GB HITACHI HDS722512VLAT20 124GB HITACHI HDS722512VLAT80 123.5GB HITACHI HDS722512VLSA80 123.5GB HITACHI HDS722516VLAT20 164.7GB HITACHI HDS722516VLAT80 164.7GB HITACHI HDS722516VLSA80 164.7GB HITACHI HDS722525VLAT80 250.1GB HITACHI HDS722525VLSA80 250.1GB HITACHI HDS722540VLAT20 41.2GB HITACHI HDS722540VLSA80 40GB HITACHI HDS722580VLAT20 80.4GB HITACHI HDS722580VLAT20 82.3GB HITACHI HDS722580VLSA80 82.3GB HITACHI HDS724040KLAT80 400GB HITACHI HDS724040KLSA80 400GB HITACHI HDS725050KLA360 500GB HITACHI HDS725050KLAT80 500GB HITACHI HDS728040PLA320 40GB HITACHI HDS728040PLAT20 41.2GB HITACHI HDS728080PLA380 82.3GB HITACHI HDS728080PLAT20 82.3GB HITACHI HDT721010SLA360 1000GB HITACHI HDT721016SLA380 160GB HITACHI HDT721032SLA360 320GB HITACHI HDT721064SLA360 640GB HITACHI HDT721075SLA380 750GB HITACHI HDT722516DLA380 165GB HITACHI HDT722516DLAT80 165GB HITACHI HDT722520DLA380 200GB HITACHI HDT722520DLAT80 200GB HITACHI HDT722525DLA380 250GB HITACHI HDT722525DLAT80 250GB HITACHI HDT725025VLA380 250GB HITACHI HDT725025VLAT80 250GB HITACHI HDT725032VLA360 320GB HITACHI HDT725032VLA380 320GB HITACHI HDT725032VLAT80 320GB HITACHI HDT725040VLA360 400GB HITACHI HDT725040VLA380 400GB HITACHI HDT725040VLAT80 400GB HITACHI HDT725050VLA36 0 500GB HITACHI HDT725050VLA360 500GB HITACHI HDT725050VLA380 500GB HITACHI HDT725050VLAT80 500GB HITACHI HITACHI_DK13FA-40 40GB HITACHI HITACHI_DK13FA-40B 40GB HITACHI HITACHI_DK14FA-20 20GB HITACHI HITACHI_DK23CA-10 9.8GB HITACHI HITACHI_DK23CA-15 14.7GB HITACHI HITACHI_DK23CA-20 19.5GB HITACHI HITACHI_DK23CA-20B 20GB HITACHI HITACHI_DK23CA-30 29.3GB HITACHI HITACHI_DK23CA-30B 30GB HITACHI HITACHI_DK23DA-20 19.5GB HITACHI HITACHI_DK23DA-20B 20GB HITACHI HITACHI_DK23DA-30 29.3GB HITACHI HITACHI_DK23DA-30B 30GB HITACHI HITACHI_DK23DA-40 39.1GB HITACHI HITACHI_DK23DA-40B 40GB HITACHI HITACHI_DK23EA-20 20GB HITACHI HITACHI_DK23EA-20B 20GB HITACHI HITACHI_DK23EA-30 30.01GB HITACHI HITACHI_DK23EA-30B 30GB HITACHI HITACHI_DK23EA-40 39.1GB HITACHI HITACHI_DK23EA-40B 40GB HITACHI HITACHI_DK23EA-60 58.6GB HITACHI HITACHI_DK23EA-60B 60GB HITACHI HITACHI_DK23EB-20 20GB HITACHI HITACHI_DK23EB-40 39.1GB HITACHI HITACHI_DK23EB-40B 40GB HITACHI HITACHI_DK23FA-30 30GB HITACHI HITACHI_DK23FA-40 40GB HITACHI HITACHI_DK23FA-60 60GB HITACHI HITACHI_DK23FA-80 80GB HITACHI HITACHI_DK23FB-20 20GB HITACHI HITACHI_DK23FB-40 40GB HITACHI HITACHI_DK23FB-60 60GB HITACHI HTC426040G8CE00 40GB HITACHI HTC426040G9AT00 40GB HITACHI HTC426060G8CE00 60GB HITACHI HTC426060G9AT00 60GB HITACHI HTE541040G9AT00 40GB HITACHI HTE721010G9AT00 100GB HITACHI HTE721010G9SA00 100GB HITACHI HTE721060G9AT00 60GB HITACHI HTE721080G9AT00 80GB HITACHI HTE726040M9AT00 40GB HITACHI HTE726060M9AT00 60.0GB HITACHI HTS421210H9AT00 100GB HITACHI HTS421212H9AT00 120GB HITACHI HTS421240H9AT00 40GB HITACHI HTS421260H9AT00 60GB HITACHI HTS421280H9AT00 80GB HITACHI HTS424020M9AT00 20GB HITACHI HTS424030M9AT00 30.01GB HITACHI HTS424040M9AT00 40GB HITACHI HTS541010G9AT00 100GB HITACHI HTS541010G9SA00 100GB HITACHI HTS541020G9AT00 20GB HITACHI HTS541040G9AT00 40GB HITACHI HTS541040G9SA00 40GB HITACHI HTS541060G9AT00 60GB HITACHI HTS541060G9SA00 58.5GB HITACHI HTS541080G9AT00 80.0GB HITACHI HTS541080G9SA00 78.5GB HITACHI HTS541210H9AT00 100GB HITACHI HTS541210H9SA00 100GB HITACHI HTS541212H9AT00 120GB HITACHI HTS541212H9SA00 120GB HITACHI HTS541260H9AT00 60GB HITACHI HTS541260H9SA00 60GB HITACHI HTS541280H9AT00 80GB HITACHI HTS541280H9SA00 80GB HITACHI HTS541610J9SA00 100GB HITACHI HTS541612J9AT00 120GB HITACHI HTS541612J9SA00 120GB HITACHI HTS541616J9AT00 160GB HITACHI HTS541616J9SA00 160GB HITACHI HTS541640J9AT00 40GB HITACHI HTS541660J9AT00 60GB HITACHI HTS541660J9SA00 60GB HITACHI HTS541680J9AT00 80GB HITACHI HTS541680J9SA00 80GB HITACHI HTS542512K9A300 120GB HITACHI HTS542512K9SA00 120GB HITACHI HTS542516K9A300 160GB HITACHI HTS542516K9SA00 160GB HITACHI HTS542520K9SA00 200GB HITACHI HTS542525K9A300 250GB HITACHI HTS542525K9SA00 250GB HITACHI HTS542580K9SA00 80GB HITACHI HTS543212L9A300 120GB HITACHI HTS543216L9A300 160GB HITACHI HTS543216L9SA00 160GB HITACHI HTS543225L9SA00 250GB HITACHI HTS543225L9SA02 250GB HITACHI HTS543232L9A300 320GB HITACHI HTS543232L9SA02 320GB HITACHI HTS545050KTA300 500GB HITACHI HTS548020M9AT00 20GB HITACHI HTS548030M9AT00 30GB HITACHI HTS548040M9AT00 40.0GB HITACHI HTS548060M9AT00 60.0GB HITACHI HTS548080M9AT00 80.0GB HITACHI HTS721010G9AT00 100GB HITACHI HTS721010G9SA00 100GB HITACHI HTS721060G9AT00 60GB HITACHI HTS721060G9SA00 60GB HITACHI HTS721080G9AT00 80GB HITACHI HTS721080G9SA00 80GB HITACHI HTS722010K9SA00 100GB HITACHI HTS722012K9A300 120GB HITACHI HTS722012K9SA00 120GB HITACHI HTS722016K9A300 160GB HITACHI HTS722016K9SA00 160GB HITACHI HTS722020K9A300 200GB HITACHI HTS722020K9SA00 200GB HITACHI HTS722080K9A300 80GB HITACHI HTS722080K9SA00 80GB HITACHI HTS723225L9A360 250GB HITACHI HTS723232L9A360 320GB HITACHI HTS726060M9AT00 60.0GB HITACHI HUA721010KLA330 1000GB HITACHI HUA721050KLA330 500GB HITACHI HUA721075KLA330 750GB There are 189 HARD DISKs listed here.