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nly sata.I have 7 drives,4 internal in soft-raid0 and 3external through a RR2302
I want to use bootcamp,but the caldigit one rally annoying can use only HD element as external drive.Is there any other choice?
In fact,I'm planing to use a raidcard to connect 4 internal drive and set a single drive to logicboard as bootdrive,But use RR2 serise or 3serise is a problem.I don't have too much budget.
Boot Camp complicates matters considerably. RocketRAID cards don't work with Boot Camp. Period.
So far, I've only found three manufacturers that can, and have models with external ports. They all require a separate OS boot drive to use Boot Camp.
Atto ExpressSAS R348
CalDigit RAID Card
Areca (multiple models). I've been looking at ARC-1680ix-12.
The Atto is interesting, in that it is an eight port card that can be configured by the user. Two internal 4 port Mini SAS connections or one internal + one external MiniSAS. It has a built in cache, but isn't upgradeable. Too expensive compared to the other options.
The CalDigit is the least expensive card of the three, at $549 MSRP.
I don't know if any other drive boxes will work with it currently. According to Jon at CalDigit, it would work with others, but specifics undefined at that time. I've been hoping that they would make the HDElement available without drives (empty).
Areca has the largest selection of models that could work, with varying configurations. Some have upgradeable cache. Some have IO Processors at 1.2 GHz (these are quite fast). They have additional features that make them appealing, such as the ability to access the card remotely via Ethernet. Currently there is a major down side. At my last contact, they wouldn't work via the external ports. They will have to sort this one out.

Cost wise, these are not the least expensive, but in the end depends on the model.
So, your intended configuration is the best to start. One OS boot drive, and 4 drives for the array. You will also need a
Mini Sas to 4 SATA cable to attach the boot drive to the logic board.
Initially, from a raw cost perspective, the CalDigit wins.

You would have to deal with the HDElement situation later if you need to go externally.
An Areca could work as well, but you need to evaluate the models. If you decide that you won't go externally, internal only models cost less. It is also possible to set-up as many as 8 HDD's in a MacPro, if you move the optical drive externally and pick up the
optical bay adapters needed.
Personally, I've been comparing the Areca ARC-1680ix-12 to the CalDigit RAID Card. Looking online, I found the CalDigit for $522 (no battery), and the Areca for $767 (no battery). My interest in the Areca is due to the possible configuration options, upgradeable cache, and it has a faster IO Processor ( the 1.2 GHz). Add $50 for 2GB of ECC memory.
Without a battery, a good UPS is highly recommended. (Required IMHO).
I know this is a lot of info. Hopefully it can help.
