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#1
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GUID vs. Apple Partition Map?
I have read here on the forum that external drives need to be partitioned using the GUID scheme in order for them to be bootable.
I have two 1TB LaCie Big Disk Extreme+ drives. One is used exclusively for Time Machine, the other is partitioned using Apple Partition Map into three drives: one for data, the other two are for use by SuperDuper! for alternating nightly scheduled backups. I was concerned after reading about the necessity of partitioning using GUID, so I booted my Macbook Pro while holding down the option key. I was able to select one of the two drives with SuperDuper! backups and booted up with no problem at all. My questions:
Thanks... Lew |
#2
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Apple strongly encourages GUID use with Intel (not Power PC) Macs, to the point that they suppress the listing of APM 'bootable volumes' in the startup disk preference pane.
It's hard to know what the advantages are or aren't -- but it's pretty clear that Apple wants GUID used.
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--Dave Nanian |
#3
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Thanks, Dave. I guess I'll bite the bullet and repartition my drives to GUID.
BTW, the two APM partions that SuperDuper! backups reside on do appear in my startup disk preference pane. Lew |
#4
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Are you on an Intel Mac?
__________________
--Dave Nanian |
#5
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Yes...
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#6
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Perhaps they've loosened this requirement in 10.5.5, Lew; they were certainly suppressed before. Regardless, though, they do strongly encourage GUID use, even though APM works.
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--Dave Nanian |
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