We want to move 30GB of data located on a 128GB ssd to another 120gb ssd. This is not possible as disk utility says that /dev/disk2s2 doesn't have enough space.

The data we want to copy is os x itself, and some programs used in the store.

Can this be solved by partitioning the 128gb ssd and than copy the partition? Or is the a command line way to achieve this?

update At this time, we partitioned the 128ssd. We just started copying, fingers crossed.

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Remote Synchronisation: rsync

Consider using OS X's Terminal.app and included rsync command line tool to safely copy the data:

sudo rsync -vaE --progress /Volumes/SourceName /Volumes/DestinationName

See Fastest and safest way to copy massive data from one external drive to another for how this command works and what each section means.

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