Once it has done that, I can restart the computer and hold down the Option key (in Windows-speak, the Alt key) and keep holding it until I see options for which drive I'd like to boot from: the original drive or the clone I just made on the external drive. I use a program called "Carbon Copy Cloner" ($40) - some people prefer "SuperDuper" ($30) - and tell it to make a bootable clone of my internal hard drive to the blank external drive (target-to-destination).Ģ. In my case the two are connected by FireWire but USB and other ways work fine.ġ. So I have a Mac (any model) and an external drive (any model, as long as it has a capacity equal to or greater than the "boot drive" (the one inside the computer). RAID does have its own 'loop holes' or short comings If you want more info just google RAID on wiki
DEFRAG MAC OS X MAVERICKS SOFTWARE
Then there is RAID Z (which is software RAID used in the ZFS file system)Īnd last but not least there is JBOD (Just a Bunch Of Disks) which is not RAID but a grouping of HDD's Which is a stripe of mirrors ( 4 HDD's, are 2 'together' for the stripe and then the 2 groups are mirrored) Or the parody itself will be missing, in that case it will rewrite it and away you go It will either be part of the data stripe (then it will use the parody to figure it out) You can replace it with a drive of similar size (or larger) and the computer will be able to figure out what data is missing The point of this is that if one hard drive fails So there will be a parody for every data stripe Then the next stripe will be written and the parody will be wrote to a different drive On the last drive (for example) it will use a mathematical algorithm to create the parody It requires a minimum of 3 HDD's but i prefer to use 4Īnd it will write the information on the array (also known as a volume) in a stripe across the drives
The higher the number the higher the redundancyįor example one of my most favorite is RAID 5 which is a stripe with a parody (the strip rotates) There are many different 'Levels' (not like a video game)
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