I am daily grateful to and for Lee, who makes my world a better
place, and who is reason enuf to buy Macs.
At 11:38 AM -0400 10/5/18, Lee Larson wrote:
On May 18, 2010, at 5:32 AM, Nelsn Helm wrote:
Any disk can be set up as any of the three schemes. You should
choose APM or GUID, depending upon whether you want to use the disk
for booting.
Can a single HD (physical disk) be formatted into a GUID volume and a
Mac OS extended volume?
2 -=-=-=-=-=-=-
Hard to justify spending $75 on a 300gb HD to boot the Intel, which
is invisible to the PPC,
when I can buy 1tb (not Intel bootable) for $125.
Why not make a non-bootable back-up of my start-up drive,
and should I need an external boot source, use the Mac OS DVD?
Any disk you buy can be set up with Disk Utility to be bootable by
one or the other type of machine.
Yes, but I keep all my data on external drives, and I want them to be
readable by PPCs.
3 -=-=-=-=-=-=-=-=
Some enclosures holding 2 HDs, e.g My Book Studio Edition II
WDH2Q20000, can be used as RAID, but seems to me tht both physical
disks would be subject to failure from the same cause, e.g. power
surge, being dropped, tornado, so no redundency within a single
enclosure.
All the RAID types, except RAID 0, provide redundancy across the
disks to protect against failure. This is pretty good insurance
against a bad block on one or the other of the drives, but nothing
is better than a full backup in another location.
I just "surface scanned" my main external HD, all my data but
pictures. It has 1,500 bad blocks. I have always backed it up, but
back-ups don't protect from data loss from bad blocks on the mother
disk. If I read it right, RAID 3 or higher stores data three places,
two mirror images and one to compare those images, looking for
differences indiciative of errors.
4 =-=-=-=-=-=-=
Is Firewire on the way out? being replaced by eSATA? gigibit ethernet?
Firewire is pretty much out for storage. It was pushed out of the
way for cheap external storage by USB2 and is being replaced on the
higher end by eSATA and iSCSI.
But my iMac does not have those jacks, so I cannot use them, so until
I get a new Mac, I shud buy USB2 rather than spend the extra on
firewire.
5 -=-=-=-=-=-=-
Hard to back-up external USB HDs to each other, bec they cannot
connect thru a hub, & Mac has limited jacks.
I have several external USB2 drives connected through a hub right
now. Either get a good externally-powered hub or, better yet,
externally-powered hard drives. You probably can't run several
USB-powered hard drives off one bus-powered or low-powered hub.
You're right. I can run them off the hub.
--
Nelson Helm
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Every child a wanted child.
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