So, I've noticed several things about devices I've seen in person. I have a Western Digital My Book 3TB External Drive Plugged into my PC that I bought from one store because it was on sale and I needed extra storage capacity. Then, at another store, I saw they sold the same external hard drive with a 4TB Disk Capacity. I also have 5 SanDisk Cruiser Glide flash drives, completely identical except for the fact that one of the drives has 16 GigaBytes of storage, another has 128 GigaBytes of storage, and the rest have 32 GigaBytes worth of storage.
So, with all this info, I believe manufacturers are manufacturing the drives with the same parts but limiting the capacity of the drive that's allocated and the prices are higher when the capacities are higher. So, my question's are if it's possible to expand the total storage capacity of these devices, such as expanding the 16GB Flash Drive to 128GB and the 3TB Hard Drive to 4TB, how do I do it? If I do it, do I lose the data on the drive itself? How do I tell if the drive can handle the capacity I give it? How can I tell up to what capacity the drive can handle? I have searched the internet and the answers seem to be quite irrelevant.
If you can shed any light on this, please do.