User avatar
Posts: 89
Joined: Sat Mar 05, 2016 1:02 pm

HDD - 2.5 " versus 3.5 " - which one to use

Thu Jun 21, 2018 10:09 am

Want to create a NAS - with Rasperrry Pi

question: do i need to have (use) a 2.5 " (external) HD or can i use a 3.5 " HD (internal) too?
Note: i have some 3.5 " HD (internal) here -

can i also use them!?

Love to hear from you

Posts: 7299
Joined: Fri May 31, 2013 9:28 pm
Location: Mansfield UK

Re: HDD - 2.5 " versus 3.5 " - which one to use

Thu Jun 21, 2018 10:31 am

You can use either via a USB interface , but the 3.5" will required its own external power supply , were as you might be able to power the 2.5" direct from the pi USB ports if you are only intending to connect one.
We want information… information… information no help
The use of crystal balls & mind reading are not supported

User avatar
Posts: 4878
Joined: Mon Apr 08, 2013 4:53 am
Location: Aloha, Oregon USA

Re: HDD - 2.5 " versus 3.5 " - which one to use

Thu Jun 21, 2018 11:54 am

The only difference between internal and external hard drives is an enclosure. You can purchase external USB enclosures for internal drives and make them external USB drives. Enclosures for 3.5 inch drives should include a power supply. Enclosures for 2.5 inch drives often don't, but most of them don't need a separate PSU and run just fine from USB power (the exception would be 7200 RPM drives, which are more power hungry).

For 2.5 inch drives you can also get a USB-SATA interface cable that looks like this.
Which won't offer any drive protection, but may be cheaper (and an SSD might not need protection).

I boot one of my Pi3B computers directly from a 128GB SSD with that cable.

If you aren't planning on booting directly from the HDD, then just about any USB enclosure should work.
My mind is like a browser. 27 tabs are open, 9 aren't responding,
lots of pop-ups...and where is that annoying music coming from?

Return to “General discussion”