1,5 TB égal 1500 GO.

1000 Go = 1 To.....

I have this in my course:
*Octet comes from the prefix Octo which means 'eight' (8) (Example: Octagon)
So, we have:
1 Bit = 0 (off) or 1 (on)
8 Bits = 1 Octet (one character???)
1,024 Octets = 1 Ko (Kilo <1000>- Octets
1,048,576 Octets or 1,024 Ko = 1 Mo (1000 x 1000 Octets = 1 Mega-Octet)
1,073,741,824 Octets or 1,024 Mo = 1 Go (1000 x 1000 x 1000 Octets = 1 Giga-Octet)
1,099,511,627,776 Octets or 1,024 Go = 1 To (1000 x 1000 x 1000 x 1000 Octets = 1 Tera-Octet)
Here we are talking in binary (1 or 0) of course
Is this false information? Some told me no, some yes, what to conclude then? And let's keep in mind that Wikipedia is not the most reliable source of information…

You are all mistaken and ignorant, 1TB = 1024GB.

10 To = 10 000 Go etc...

So if I understand correctly, buying an external hard drive is useless for increasing the performance of certain games!?
So what could actually help me get more power?

The processor, RAM, and caches are the power and speed... The internal hard drive, depending on its quality, can enhance performance... An external hard drive is for storage... The PCI, PCIe, or AGP connections are meant to improve graphics or sound compared to what is offered by the motherboard and other "hardware" utilities... With more knowledge, we can further improve performance, as gamers do...

Thank you for these answers!
But just a simple question, if I buy an external hard drive, I will of course have more memory for my PC, but will I have more power to launch and run certain games?
Thank you in advance.

no, that has nothing to do with it!!
here it's the RAM, the graphics card that comes into play...

RAM can help (random access memory)
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they say "Google is your friend"... but so is Wiki! Be polite, write in understandable French!
modern proverb: turn the mouse 7 times on the rug before posting!

I'm a bit useless, so what does RAM mean?

In simple terms, it's the memory that your PC and applications use, which gets erased when you turn it off. The more RAM (random access memory) you have, the faster your computer is!
You also need a powerful graphics card so that all games can run smoothly (especially GTA IV and Crysis).
But maybe you don't need more RAM (since you might have enough); you just need a good graphics card!

Here you go!

to run a game on an external hard drive because USB is slower than SATA

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Oh My God !!