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I have weird situation in my iMac drive. I have 2 equal size partitions (2x250Gb). I have tested new OS version (Sierra) on second partition and erased primary partition cause Sierra works smoothly. I wanted to reduce size of primary partition to use more space for secondary, but that cannot be done as I read. Is there any way, without additional HDD to copy second partition to first one, and then to be able to remove second partition so system will be on whole drive. I have tried to restore first partition using disk tools with second partition as a source, but, since it is bootable partition, disk utility won't copy it with message "Source volume is read-write and cannot be unmounted, so it can't be block copied.".
Any idea will be appreciated.
Carbon Copy Cloner could clone one partition to the other, allowing you to then delete the 2nd partition & extend the first. You've probably already discovered you cannot 'extend' to earlier on the drive, only later. As far as I'm aware, CCC actually just uses a built-in command-set,
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but is a lot easier to work with than Terminal. – Tetsujin – 2016-11-20T10:24:47.767@Tetsujin was right. CCC done the job. I just clone second partition to primary, make primary partition to boot with, rebooted and removed second partition (merged with primary)! Thanks man! – Војин Петровић – 2016-11-20T12:14:02.927
Glad it worked - I normally don't like to post "software recommendations" as answers, but honestly I think CCC is a no-brainer for this type of issue... let me throw it in as a quick answer. – Tetsujin – 2016-11-20T12:31:02.213