HFS is limited to 2 gigabytes. HFS+ used to be limited to 2 terabytes because it allowed for up to 2^32 blocks, the same as original SCSI-2, but that's been updated. I have a couple of arrays with single HFS+ volumes in excess of 25 terabytes.

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Sorry - you're right - I was speaking about things too specifically.

I'm curious where you come up with this stuff. Look in the other thread about this same issue. I posted a screenshot of a 40gb IDE drive formatted in HFS(not HFS+) and it uses all 40gb's(well 38. something) HFS has no known limit as well as HFS plus. IDE and bus protocols are SEPARATE from file systems and have no impact on them.

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Yes, you're right - the maximum volume size under System 6 and 7 is 2 gigabytes. With System 7.5, the limit was raised to 4 gigabytes and System 7.5.2 and later increased that limit to 2 terabytes. However, HFS (non-plus) only allows for 2^16 allocation blocks, so a 2 terabyte volume formatted as HFS would use 32 megabytes per file at minimum, no matter how much data was in the file.

Soon as I can get a replacement HD of larger than 130gb's, I'll stick it in my Frankenstein machine and format it, you just have to know how to do it, and what apple tools to use. Don't mean to sound insulting if I am sounding that way, but I have been doing this since the mid 90's and am old and grumpy.
P.S. And when formatting a 40gb HD with plain old HFS, the smallest file size is 1.1mb's Not very usefull is it?

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Not particularly efficient, but that's why it's good to have a small HFS partition for booting and HFS+ for the rest of the drive.

I'd enjoy being happily wrong about the IDE controller on the Quadra 630, just as I learned recently that the Quadra 840AV will support four 128 meg SIMMs, but a lot of older controllers don't support 48 bit allocation blocks. I look forward to seeing this!