'''HD Interface:''' Serial ATA (1.5 Gb/s) - so no new 3 or 6Gb/s drives will work, I do not think there were TB drives even built for home machines in the days of SATA 1 and SATA II ''(I could be wrong).''
'''Details: '''This model supports hard drives larger than 128 GB [http://www.everymac.com/systems/apple/imac/specs/imac_cd_1.83_17_ig.html|the definitive site].
As to [http://www.everymac.com/systems/apple/imac/faq_cd/imac-intel-processor-upgrade-video-upgrade.html|upgrading the processor] (from the same site).
''If this answer is acceptable '''please remember to return and mark it'''.''
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== UPDATE == because the comment string is so long it disappeared I moved my comment/reply here:
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''' Some of these Automagic detecting" drives do not perform as advertised. ''' ''There have been many users here who came in with a variety of problems that turned out to be self-adjusting drives that didn't ''(self-adjust that is). I do not have a list of deceptive drives, nor one of reliable automagic adjusting drives.... maybe someone else has kept track.
'''HD Interface:''' Serial ATA (1.5 Gb/s) - so no new 3 or 6Gb/s drives will work, I do not think there were TB drives even built for home machines in the days of SATA 1 and SATA II ''(I could be wrong).''
'''Details: '''This model supports hard drives larger than 128 GB [http://www.everymac.com/systems/apple/imac/specs/imac_cd_1.83_17_ig.html|the definitive site].
As to [http://www.everymac.com/systems/apple/imac/faq_cd/imac-intel-processor-upgrade-video-upgrade.html|upgrading the processor] (from the same site).
''If this answer is acceptable '''please remember to return and mark it'''.''