What are 19mm high 3.5" hard disks called?

According to Wikipedia a normal 3.5" harddisk is 25.4mm high, but then there exist also a 19mm version, which I need for a HP ProLiant MicroServer.

Looking at our resellers webshop I see the following options

• 1/3H
• SlimLine
• 1/2H
• 1/4H
• LFF

When I search for the model number VB0250EAVER on the disk that just broke, some webshops call it for LFF, which should be Large Form Factor, which I find weird, as it is smaller than a normal 3.5".

Question

Does anyone know for sure what the 19mm model is called?

The term for this type of disk is a slimline 20mm disk. The OEM for the HP drive you've mentioned is the Seagate ST3250318AS

The Microserver uses it's own special drive trays/carriers. You can use any 3.5" disk in the enclosure, though.

Here's a list of community-submitted compatible drives.