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Difference between 2.5" hard disk and 3.5" hard disk

kianhow
kianhow asked
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Last Modified: 2013-12-27
What is the difference between 2.5" hard disk and 3.5" hard disk?
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Top Expert 2006
Commented:
The main difference is the size,

a 3.5" is cheaper and normally in a desktop
a 2.5" is more expensive and normally used in a laptop.

you can get them with the same specs in terms of cache - speed and capacity (but generally 3.5" is larger first)

You also need different housings for them - ie you can not put a 2.5" in most external enclosures for a 3.5" drive

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Lee W, MVPTechnology and Business Process Advisor
CERTIFIED EXPERT
Most Valuable Expert 2013

Commented:
1"

But seriously, the 2.5" hard drives are generally used in notebooks and some high-end blade servers.  They are typically about the size of a credit card, only 9-12 mm in thickness.  They also have smaller maximum capacities, I believe currently topping out at 120 GB where as 3.5" drives max out at 750 GB.

3.5" hard drives are used in most desktops and servers - they are about the size of a paperback novel.

Author

Commented:
Is the 3.5" means the size of the disc in the hard disk?
Top Expert 2006

Commented:
yes - in inches
Lee W, MVPTechnology and Business Process Advisor
CERTIFIED EXPERT
Most Valuable Expert 2013

Commented:
I believe the naming is because the drive size is the same as a standard 3.5" floppy drive size.  The 3.5" floppies were 3.5" wide and the hard drive is the same size, only longer (deeper).
Top Expert 2006

Commented:
that was the impression that I had - that it is to do with the width - across the front - ie the input ports are at the back,

the 2.5" are considerably shorter and not as long as the 3.5
Lee W, MVPTechnology and Business Process Advisor
CERTIFIED EXPERT
Most Valuable Expert 2013

Commented:
huh.... so my comments were useless to you?  And the answers provided weren't good?  Can you explain why you gave a C grade on this - what other information were you looking for?
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