|Your hard drive model is IDE (EIDE).|
All laptop IDE drives have the same socket built into the drive with a 44 "pin" header - it has 43 pins (not pin holes) on it.
If you can't see 43 pins on the drive's socket, you must remove some adapter that is on the pins that was used when it was in the laptop.
We can't tell you which adapter you may have on those pins until you tell us which laptop make and model you had the hard drive installed in.
The instructions about how to remove the hard drive and install a different one are probably in your User's or Owner's manual for the laptop model, and if so, that would tell you if you need to remove an adapter from the pins on the hard drive and how to do that.
The external drive enclosure must have a female connector for a laptop IDE drive. It's a 40 "pin" female connector (holes; it may have one blocked pin hole).
4 of the pins on the hard drive are not plugged into the female connector on the external enclosure. Those 4 pins are for installing a jumper on. You install a jumper on one pair to set the drive to slave, on the other pair to set the drive to cable select.
The drive is set to master when there is no jumper on either pair of pins.
When you install a laptop drive in an external enclosure, you don't need a jumper to be on a pair of those pins.
The 40 "pin" female connector on the external enclosure may have one blocked pin hole. If so, it can only be installed on the pins on the hard drive one way in one position - when the blocked pin hole lines up with the missing pin on the drive.