So, I was trying to make a new partition using the Windows 7 built in Disk Manager on a HP desktop computer with Windows 7 pre-installed and stuffs. When finishing the new partition wizard, there is an alert saying something like "you won't be able to boot from partitions other than the primary boot drive" and something about "converting into dynamic". I didn't know what it means, so I clicked "no". I tried the wizard again, and the alert shows again, and I clicked "yes" this time.
So, looks like the damage is done, the whole hard drive turned into dynamic. After some google searches, I find out that converting it back to basic is not a click away task, and I can't install Ubuntu on a dynamic drive either (which was my intention at the first place).
I want to know why does this happen. And after converting it back to basic drive, will it guarantee me to create new partitions safely in the future without the risk of turning into dynamic drive again?