Does lga 1366 platform have a hard drive capacity limit?

It will handle the currently available HDDs, like 3TBs without any issues. You may want to consider installing Windows and other programs on a smaller HDD like 320 GB to 500 GB (I have 500 GB), then utilize the larger 3 TB HDD for data storage, music, videos, etc.

In addition to the above, you must consider having an external HDD, 3 TBs as the case may be, for backups.

If you want very large storage for some reason, you need LBA (Large Block Array), but most users don't go that way - http://www.howtofixcomputers.com/forums/windows-xp/hard-drive-size-limitations-250399.html
 

HDD? No. You will get SATA 2 speeds. (At a future date when you upgrade your mobo to SATA 3 you can get full utilization of the SATA 3 HDD)
 

No performance degradation if that is your concern.

(No. You will get SATA 2 speeds. At a future date when you upgrade your mobo to SATA 3 you can get full utilization of the SATA 3 HDD)
 

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Titan
Moderator

Mechanical HDDs are only pushing 120-150MB/sec, barely hitting SATA-1's performance ceiling. SATA-2 is not going to be a limiting factor on those any time soon.

The main benefits of SATA-3 are for either:
- high-performance SSDs
- SATA port replicator (large storage arrays)

For most people, SATA-3 is only needed for SSDs where the better ones can push over 500MB/s.