I'm trying to run disk first aid on a time machine disk. It's a 2 GB disk, with about 628 GB used. How long should it take to run "Checking multilinked files."? Would it run faster if it had more memory to play with? Currently it's using only 3.01 GB. Apparently fsck-hfs has a '-c' flag if run from the command line. Is there any way to safely abort the process?