http://www.seagate.com/support/kb/disc/faq/137_mac.html
...a chunk of quote is appropriate here (note that the actual limit is 137 Gb):
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Why can I only see 127 to 137 GBytes of my 160 GB drive in Macintosh System X?
Macintosh System X on a Traditional Motherboard
Most Apple Macintosh systems have a native limitation of 137GB supporting ATA interface disc drives. Operating system support for 48-bit LBA addressing begins with OS X 10.2/9.2.2. BootROM support for 48-bit is also a requirement. For further information, see AppleCare Document 86178 (http://tinyurl.com/fvrk).
48-bit disc drives attached to systems built prior to OS X 10.2/9.2.2 and without adequate BootROM support will be limited to 137GB. Otherwise, you could consider the purchase of an Ultra ATA/133 PCI controller card specifically designed for Macintosh computers, available from most retail and online computer stores.
Macintosh System X on a PCI Controller Card
New controller cards are available that support ATA interface disc drives through their own onboard BIOS and custom Mac OS device drivers. Please see our list of 3rd party companies which are known to manufacture ATA controller cards that support Mac OS drives greater than 137GB.
For more background information about 48-bit LBA addressing please visit our overview on this issue. You may also use our Capacity Limitations Walk-Through for 137 GByte limits, as well as other capacity limitations.
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So you might want to do some more investigating before writing off using Very Large Drives.
Dennis Moser "That so few now dare to be eccentric, marks the chief danger of the time." ~~~~ John Stuart Mill
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