Sata 1 5 disk drive compatible with sata 3 0

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I just ordered an ASUS Sabertooth 990FX AM3+ motherboard to accommodate my AMD Phenom II X 6 1100T CPU. The main SATA ports on the MB are SATA 3 (6GB). I intend to get a SSD for a boot drive but I have 4 other HDD's that are old and I think you call then SATA 1.5. Are these older drives compatible with SATA 3 ports on the MB. I just assumed they were compatible.
Thanks for your help with this,

 

[Paperdoc]

Yes, they are compatible. However, check your mobo and its manual carefully. Many mobo's now come with both SATA 3.0 Gb/s and SATA 6.0 Gb/s ports for HDD's. There are NO mechanical (spinning disk) HDD's that can exceed the speeds of the SATA 3.0 Gb/s systems (and certainly not your older SATA 1.5 Gb/s units), so you should reserve the true 6.0 Gb/s ports of the mobo for really fast devices like SSD's if you have the choice.

 

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Thanks, I can rest easy now. The new motherboard is on its way from New Egg.