Add another hard drive to 590-p0020?

[chipfrazier73]

What is the maximum capacity internal hard drive I can add to the stock 1TB drive in the HP Pavilion Desktop 590-p0020?

[erico]

Are you asking about old school SATA-3 storage devices or SSD products?

If you mean old school hard disks, you could install an 8 TB hard disk if you wanted.

Don't forget to add a 256 GB SSD in and  migrate the OS to it.  You can use for the boot disk if you are looking for a performance boost.

[chipfrazier]

Thank you. 

I have a new Pavilion Desktop 590-p0020 with a stock SATA 1TB drive.  I assume it is SATA 3, but the label doesn't indicate more than "SATA".  Ultimately, I need more than 4 GB of RAM and at least 2, and preferably 4 TB, on a second internal drive for video editing.  My priorities are increasing RAM and adding a large second HDD. 

Improving performance by migrating the Windows 10 OS to a SSD is attractive, but I hate to throw out/sell the brand new 1TB drive and incur the cost of yet another drive in addition to the RAM and larger HDD I intend to add.  My second problem is that I don't know how to migrate the OS to a SSD.

[erico]

Since your desktop is of the new generation it does indeed have SATA-3, which translates to a  6GB/s connection.

You wouldn't have to throw out\sell the original hard disk. That is what USB external disk enclosures are made for.  They are quite inexpensive and connect to an available USB  2.0 (60 MB/s) or USB  3.1 (10 GB/s) port at the rear of the PC. Use the USB 3.1 port for the higher bandwidth data transfers. That would give you three hard drives and plenty of storage space.

Migrating an OS to an SSD is something that I described in a sticky at the top of the notebook section. It is the identical procedure as in a notebook, except it is easier. You won't need an external USB to SATA connector because you can temporarily connect the new SSD to a spare SATA connector in the  desktop PC. Samsung gives access to the Samsung Data Migration software  and Samsung Magician software for OS migration to owners of Samsung SSD products.

Guaranteed compatible memory for the memory upgrade.

http://www.crucial.com/usa/en/compatible-upgrade-for/HP---Compaq/pavilion-590-p0020

@chipfrazier

Your desktop PC's motherboard has an M.2 PCI Express SSD type M.2 slot. So you can upgrade without even removing the original legacy hard disk.