Hi and Welcome!
As already mentioned, this drive is made by Toshiba-Samsung. This is an OEM version made for Dell here. There are also versions of that drive for other big brand computers (HP, Acer etc.)
Since you want to replace it, get the Service Manual for your laptop. It is available on Dell support website.
The replacement drive must not necessarily be from the same manufacturer, but you have to keep in mind:
- this is an older model with PATA interface, you need a replacement drive with the same internal Master/Slave setting.
- custom front plates can be a real showstopper that is forcing you to buy basically the same drive again.