[SOLVED] A question concerning 2.5 vs 3.5 HDD

[punkncat]

I had always been under the impression that 2.5" drives were faster than a 3.5" drive in relation to same vs same spin speed due to the decreased distance the heads have to move.
Read an article here/somewhere discussing that 2.5 is actually the slower of the two.

Confirm?

 

[USAFRet]

I had always been under the impression that 2.5" drives were faster than a 3.5" drive in relation to same vs same spin speed due to the decreased distance the heads have to move.
Read an article here/somewhere discussing that 2.5 is actually the slower of the two.

Confirm?

Other way around.
2.5" are generally 5400RPM (save power in a laptop)
3.5" are either 5400RPM or 7200RPM, with some 5900 sprinkled in.

But, the larger diameter means greater linear speed at the outer portions/tracks, for the same RPM.
And, 3.5" can go much larger GB than 2.5".
You'll not yet find a 10TB 2.5" drive.

 

[Steve0298]

Generally it comes down to the RPM of the drives and that’s what will determine what drive is faster. Size doesn’t matter in this equation.

 

[jeremyj_83]

I had always been under the impression that 2.5" drives were faster than a 3.5" drive in relation to same vs same spin speed due to the decreased distance the heads have to move.
Read an article here/somewhere discussing that 2.5 is actually the slower of the two.

Confirm?

2.5" drives also tend to have less cache than the 3.5" drives. The cache helps with burst performance and writes. HGST created what they called a media cache, this wasn't part of the regular cache, with the HE8 line and later drives that used free space on the drive to cache and then write at a high queue depth. This ended up allowing their 3.5" 7200 RPM drives to have the write IOPS performance of competing 2.5" 10k RPM drives.