# Is there a limit in GB/TB external drive to be used on a Laptop

1. ## Is there a limit in GB/TB external drive to be used on a Laptop

On a laptop there is one USB C-port, two USB 3 ports and a normal USB port.
I got external drives such as
1, 2 TB,
2, 500 GB x2,
3. 250 GB x2
all these use some kind of power right? I wonder if there is any limit in Bytes MB/GB/TB I can use on one laptop?
Or using more (I mean in Bytes) External hard drives will slow down computer,

Any explanation in this regard will be much appreciated.
Thank you.
My Computer

2. There is a finite limit that can be mapped for a given file system, but nobody has created a drive of that size as of yet. But with 5 non-powered drives, you may run into power issues with your laptop. Since your laptop only has 3 drives, you can't hook them all up. You can if you use a powered hub to have all of them connected.

If you subtract what the power requirements are for your system, from the total watts that the power supply is providing, that will leave you with (n) of additional watts that can be used by your external drives. You may not be able to hook all 3 of them all up. What you would see is the external drives dropping out of a ready state because you lack the necessary power.

I have 10 external drives but they all have their own power supplies. Never have tried to have all of them mounted at one time but I've done 5 with no problem.
My Computers

3. storageman said:
There is a finite limit that can be mapped for a given file system, but nobody has created a drive of that size as of yet. But with 5 non-powered drives, you may run into power issues with your laptop. Since your laptop only has 3 drives, you can't hook them all up. You can if you use a powered hub to have all of them connected.

If you subtract what the power requirements are for your system, from the total watts that the power supply is providing, that will leave you with (n) of additional watts that can be used by your external drives. You may not be able to hook all 3 of them all up. What you would see is the external drives dropping out of a ready state because you lack the necessary power.

I have 10 external drives but they all have their own power supplies. Never have tried to have all of them mounted at one time but I've done 5 with no problem.
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Hi, thank you very much for the precise and easy to understand answer. i had completely forgotten about the power supply though I had purchased the power hub but not using in Windows 10 computer. Also External drives got power supply too.
You are correct about the "What you would see is the external drives dropping out of a ready state because you lack the necessary power. "

Thank you very much.
My Computer

4. Great - Please mark the thread as "Solved". Thank you
My Computers

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