erasing and creating failed could not unmount disk

Contact the software manufacturer for assistance. (6) if i tried to simply reinstall the system, the process seems to start at first but after a couple of minutes stops with the message 'Install failed, MacOs could not be installed on your computer, the installer encountered an error that caused the installation to fail. (5) if i tried to recover the entire system from the Time Capsule backup, the error message appears immediately offering to reboot and try again

(4) if i tried to resize the Macintosh HD partition in Partition window, it returns the same - 'Cannot be resized Could not unmount disk' (3) if i tried to format with Erase i got 'Volume erase failed with the error Could not unmount disk' (3) For doublechecking run 'Disk verify' again receiving 'The volume Macintosh HD appears to be OK' as result (2) I could also Verify disk permissions successfully Finnaly i have 'Was repaired successfully' from it (1) Repair with Disk Utility - upon the process, two allert messages appear - 'Volume bitmap needs minor repair for under=allocation' and 'Volume header needs minor repair'. After i boot it from original MacOs DVD i tried the following More drives in the array means higher bandwidth, but greater risk of data loss.I am having a serious problem with my and need a help urgently. RAID 0 does not implement error checking, so any read error is uncorrectable. This allows smaller sections of the entire chunk of data to be read off each drive in parallel, increasing bandwidth. The blocks are written to their respective drives simultaneously on the same sector. The number of blocks is dictated by the stripe size, which is a configuration parameter of the array. Following this, attempt to Erase/Partition the drive again in Disk Utility. A single drive failure destroys the entire array because when data is written to a RAID 0 volume, the data is broken into fragments called blocks. You can force unmount a drive by running the following Terminal command: diskutil unmountDisk force /Volumes/VOLUMENAME Replace VOLUMENAME with the name of a volume on the disk you are trying to unmount. Any drive failure destroys the array, and the likelihood of failure increases with more drives in the array ( at a minimum, potential for catastrophic data loss is double that of isolated drives without RAID). Hence simple stripe sets are normally referred to as RAID 0.

It provides improved performance and additional storage but no fault tolerance. Wikipedia article: RAID wrote: RAID 0 (block-level striping without parity or mirroring) has no (or zero) redundancy.

Erasing and creating failed could not unmount disk