[SOLVED] My Samsung 3m 500gb External Hard drive only let me use 140gb of space

[rodneyjaysongenerillo]

I cant use the remaining 340gb of my 500gb samsung 3m hard drive

 

[popatim]

You'd need a really old motherbd to hav e th 137GB issue.
So assuming you don't then host a screen shot of your disk management window (run diskmgmt.msc) and post a link to it here so we can take a look. Its probably only partitioned to 140Gb's and yo might only need to expand it (do a backup first).