I'm going to assume that you are using Windows. If you are then you can try this.
Open a command prompt window. Either use WinKey-R, type
cmd, and press enter or look for Accessories -> Command Prompt in the Start Menu.
Open the device manager by typing
devmgmt.msc in the command prompt window and press enter.
Look for the category named
Disk Drives and expand it.
Since you are using a laptop there should be only 1 hard drive and thus 1 entry. That entry should give you the model number and possibly manufacturer for the drive.
Google for it. The description for the drive should almost immediately tell you whether it is SATA or PATA.
FWIW, the next time you ask a question please include details such as what operating system you are using. It helps when trying to answer to have some context to work with.
In hindsight it came to me that it would probably help to see how the drives connectors differ. So after Googling about a bit, I came up with the image below from this site..
The above may not actually be a very good comparison pic. The SATA drives I'm familiar with all have a protective half-shell surrounding the contact pads. They look like the drive in the picture below. Or you could also look at the product pictures for this HITACHI Travelstar 5K500.B at newegg.com.