You can estimate the RAID characteristics using this RAID calculator. Usage
instructions are simple: select the desired array layout, then enter RAID
member disk capacities into the corresponding form fields. The rest is done
automatically.
For more information about RAID and RAID levels, please refer to
RAID 101.
Notes
Write speed of a RAID 5 depends upon the controller implementation
heavily. The estimation of a write speed is thus not provided for a RAID5.
Setups involving more than two member disks in a RAID1 (Mirror) array are
allowed but rarely used. Additional backup ("shadow") disks provide additional fault tolerance
at the cost of storage space overhead.
RAID10 survives any single disk failure and a half of double failures
(depending on the assignment of the failed drives).
ZAR: It reads your lips, it reads your mind, it reads your crashed hard drives.
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Our customers say
ZA works! I downloaded and tried at least 16 other programs,
but none recovered a single image.
ZA saved 159 photos (all of the images on the card, as far as I can remember).
My 512MB SD card was corrupted when I plugged it into a card reader to make a backup.
[...]
Every search turned up fewer "new" programs to try.
Tonight I downloaded 4 "new" programs (3 of them didn't work....) ZA works!
[...] won't recognize any drives -- unless I'm logged in as Administrator. An undocumented shortcoming.
