Mac El Capitan: Checking disk space available and reducing the size

How do I check the disk utilized on my 500GB flash drive?

Then, how do I find a list of files, in order of file size?

newbiewebSr. Software EngineerAsked:
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You can open finder.  Select the mounted USB disk.  Do a Get Info.
Open a folder and sort by size.

If you meant the boot disk, open Finder.  Press shift command c.  Select your Mac Hard disk.  Do a Get Info (command i)

On the command line.  df -h will show how much space is utilized by each mounted device.
ls -S will sort by size.
ls -lS will sort by size and show you sizes.
newbiewebSr. Software EngineerAuthor Commented:
I was hoping for a program that would list all files by size and allow me to look at and delete those files. I once found a useful program with that functionality.
David AndersTechnician Commented:
Grand Perspective should give you the info you are looking for.

This is a list of alternatives

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