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 SAMSUNG that include a temperature sensor Manufacturer Model Size Notes SAMSUNG SAMSUNG HA200JC 200GB SAMSUNG SAMSUNG HA250JC 250GB SAMSUNG SAMSUNG HD040GJ/P 40GB SAMSUNG SAMSUNG HD080HJ/P 80GB SAMSUNG SAMSUNG HD081GJ 80GB SAMSUNG SAMSUNG HD082GJ 80GB SAMSUNG SAMSUNG HD103UI 1000GB SAMSUNG SAMSUNG HD103UJ 1000GB SAMSUNG SAMSUNG HD120IJ 120GB SAMSUNG SAMSUNG HD120IJ/P 120GB SAMSUNG SAMSUNG HD160HJ 160GB SAMSUNG SAMSUNG HD161JJ 160GB SAMSUNG SAMSUNG HD162HJ 160GB SAMSUNG SAMSUNG HD200HJ 200GB SAMSUNG SAMSUNG HD250HJ 250GB SAMSUNG SAMSUNG HD250KD 250GB SAMSUNG SAMSUNG HD251KJ 250GB SAMSUNG SAMSUNG HD252HJ 250GB SAMSUNG SAMSUNG HD252KJ 250GB SAMSUNG SAMSUNG HD300LD 300GB SAMSUNG SAMSUNG HD300LJ 300GB SAMSUNG SAMSUNG HD320KJ 320GB SAMSUNG SAMSUNG HD320LD 320GB SAMSUNG SAMSUNG HD320LJ 320GB SAMSUNG SAMSUNG HD321LJ 320GB SAMSUNG SAMSUNG HD322HJ 320GB SAMSUNG SAMSUNG HD400LD 400GB SAMSUNG SAMSUNG HD400LJ 400GB SAMSUNG SAMSUNG HD401LJ 400GB SAMSUNG SAMSUNG HD402LJ 400GB SAMSUNG SAMSUNG HD403LJ 400GB SAMSUNG SAMSUNG HD500LJ 500GB SAMSUNG SAMSUNG HD501LJ 500GB SAMSUNG SAMSUNG HD502HI 500GB SAMSUNG SAMSUNG HD642JJ 640GB SAMSUNG SAMSUNG HD753LJ 750GB SAMSUNG SAMSUNG HE103UJ 1000GB SAMSUNG SAMSUNG HE160HJ 160GB SAMSUNG SAMSUNG HE502IJ 500GB SAMSUNG SAMSUNG HM030GC 30GB SAMSUNG SAMSUNG HM040HI 40GB SAMSUNG SAMSUNG HM060HC 60GB SAMSUNG SAMSUNG HM060HI 60GB SAMSUNG SAMSUNG HM060II 60GB SAMSUNG SAMSUNG HM080GC 80GB SAMSUNG SAMSUNG HM080HC 80GB SAMSUNG SAMSUNG HM080IC 80GB SAMSUNG SAMSUNG HM080II 78.5GB SAMSUNG SAMSUNG HM100JC 100GB SAMSUNG SAMSUNG HM100JI 100GB SAMSUNG SAMSUNG HM120IC 120GB SAMSUNG SAMSUNG HM120JC 120GB SAMSUNG SAMSUNG HM120JI 120GB SAMSUNG SAMSUNG HM121HC 120GB SAMSUNG SAMSUNG HM121HI 120GB SAMSUNG SAMSUNG HM160HC 160GB SAMSUNG SAMSUNG HM160HI 160GB SAMSUNG SAMSUNG HM160JC 160GB SAMSUNG SAMSUNG HM16HJI 160GB SAMSUNG SAMSUNG HM201JJ 200GB SAMSUNG SAMSUNG HM250JI 250GB SAMSUNG SAMSUNG HM251JI 250GB SAMSUNG SAMSUNG HM251JJ 250GB SAMSUNG SAMSUNG HM320JI 320GB SAMSUNG SAMSUNG HM400LI 400GB SAMSUNG SAMSUNG HM500LI 500GB SAMSUNG SAMSUNG HS06THB 60GB SAMSUNG SAMSUNG HS082HB 80GB SAMSUNG SAMSUNG HS122JC 120GB SAMSUNG SAMSUNG MP0302H 30.1GB SAMSUNG SAMSUNG MP0603H 60.1GB SAMSUNG SAMSUNG MP0804H 80.1GB SAMSUNG SAMSUNG SP0401N 40.1GB SAMSUNG SAMSUNG SP0411C 40GB SAMSUNG SAMSUNG SP0411C/R 40GB SAMSUNG SAMSUNG SP0451N 40GB SAMSUNG SAMSUNG SP0612N 60.1GB SAMSUNG SAMSUNG SP0802N 80.1GB SAMSUNG SAMSUNG SP0802N/P 80GB SAMSUNG SAMSUNG SP0802N/R 80.1GB SAMSUNG SAMSUNG SP0812C 80.1GB SAMSUNG SAMSUNG SP0812N 80.1GB SAMSUNG SAMSUNG SP0842N 80GB SAMSUNG SAMSUNG SP1203N 120.1GB SAMSUNG SAMSUNG SP1213C 120.1GB SAMSUNG SAMSUNG SP1213N 120.1GB SAMSUNG SAMSUNG SP1223N 120GB SAMSUNG SAMSUNG SP1233N 120GB SAMSUNG SAMSUNG SP1243N 120GB SAMSUNG SAMSUNG SP1253N 120GB SAMSUNG SAMSUNG SP1603C 160GB SAMSUNG SAMSUNG SP1604N 160.0GB SAMSUNG SAMSUNG SP1604N/R 160GB SAMSUNG SAMSUNG SP1613N 160GB SAMSUNG SAMSUNG SP1614C 160.0GB SAMSUNG SAMSUNG SP1614C/R 160GB SAMSUNG SAMSUNG SP1614N 160.0GB SAMSUNG SAMSUNG SP1624N 160GB SAMSUNG SAMSUNG SP1634N 160GB SAMSUNG SAMSUNG SP1644N 160GB SAMSUNG SAMSUNG SP1654N 160GB SAMSUNG SAMSUNG SP2001H 19.6GB SAMSUNG SAMSUNG SP2004C 200GB SAMSUNG SAMSUNG SP2014N 200GB SAMSUNG SAMSUNG SP20A1H 20.1GB SAMSUNG SAMSUNG SP2504C 250GB SAMSUNG SAMSUNG SP2514N 250GB SAMSUNG SAMSUNG SP4002H 39.1GB SAMSUNG SAMSUNG SP40A2H 39.1GB SAMSUNG SAMSUNG SP6003H 60.1GB SAMSUNG SAMSUNG SP60A3H 60.1GB SAMSUNG SAMSUNG SP8004H 78.2GB SAMSUNG SAMSUNG SP80A4H 80.1GB SAMSUNG SAMSUNG SV0211H 20.1GB SAMSUNG SAMSUNG SV0221H 20.1GB SAMSUNG SAMSUNG SV0221N 20.1GB SAMSUNG SAMSUNG SV0301H 30.1GB SAMSUNG SAMSUNG SV0401H 40.1GB SAMSUNG SAMSUNG SV0411N 40.1GB SAMSUNG SAMSUNG SV0412H 40.1GB SAMSUNG SAMSUNG SV0602H 58.7GB SAMSUNG SAMSUNG SV0802E 80.1GB SAMSUNG SAMSUNG SV0802N 80.1GB SAMSUNG SAMSUNG SV0813H 80.1GB SAMSUNG SAMSUNG SV1203N 117.2GB SAMSUNG SAMSUNG SV1204H 117.2GB SAMSUNG SAMSUNG SV1604E 160GB SAMSUNG SAMSUNG SV1604N 160.0GB SAMSUNG SAMSUNG SV2001H 19.6GB SAMSUNG SAMSUNG SV2011H 19.6GB SAMSUNG SAMSUNG SV3012H 29.4GB SAMSUNG SAMSUNG SV4002H 39.1GB SAMSUNG SAMSUNG SV4012H 39.1GB SAMSUNG SAMSUNG SV6003H 58.7GB SAMSUNG SAMSUNG SV8004H 78.2GB There are 135 HARD DISKs listed here.