Upgrade your Mac Studio M3 Ultra to a 2 TB internal SSD
This drive from Polysoft replaces whatever drive you have installed internally in your Mac Studio Ultra M3 internal slot 00. Replacing a Mac with only one internally installed SSD drive with this SSD drive will leave the Mac with 2 TB of total internal SSD storage.
IMPORTANT NOTE!: Apple's design does NOT permit re-using the old drive in the Mac's slot 01! For example, if you currently have a 1 TB SSD in a Mac Studio Ultra M3, you can NOT install this 2 TB upgrade drive in slot 00, then install your old 1 TB drive in the second slot 01 for a total of 3 TB. Apple's design does NOT allow this to be possible. So, if you currently have a 1 TB drive and replace it with this 2 TB drive, you will only be able to have 2 TB, total.
Polysoft is a French company (just do a Google search for Polysoft). These upgrade drives are now no longer available and are OUT OF STOCK! So now, they are very, very difficult, if not impossible, to get.
This drive has been tested and is working 100%. It comes complete with a printed color manual (all in English) very easy to follow, requiring minimal knowledge and skill to install.
If needed, a competent computer or phone repair shop could likely perform the upgrade for you.
All the best!