Remove GPT - Default back to MBR

I keep receiving this error: > Warning!! Unsupported GPT (GUID Partition Table) detected. Use GNU Parted I want to go back to the normal MBR. I found some advice [here](http://lukas.zapletalovi.com/2011/12/how-to-get-rid-of-guid-partition-table.html) and did: parted /dev/sda mklabel msdos quit But when I get to the mklabel option it spits out a warning that I will lose all data on /dev/sda. Is there a way to get the normal MBR back without formatting the disk?