image of max drive height of a dell optiplex 9020m

Max Drive Height for a Dell Optiplex 9020M

I recently decided I wanted to downsize my home server to something that can be mounted on my wall or under my desk, so I started looking for options. I really liked the idea of getting a micro computer, such as the Dell Optiplex 9020M or HP Elitedesk G1, but they only take laptop (2.5″) drives. With that, I found any 2.5″ drive or 4TB or 5TB capacity is 15mm height, whereas everything 2TB and smaller is 9mm or 7mm. However, max drive height specs aren’t usually published for most computers. So, what is the max drive height for a Dell Optiplex 9020M?

Dell Optiplex 9020M Drive Caddy

The hard drive in a 9020M is a flexible, plastic holder that slides into place in the chassis:

The issue with the caddy is that there’s only room for up to a 9mm drive to fit (with about 1.5mm of space to spare):

a 9mm drive in a dell optiplex 9020m drive caddy
9mm drives fit with 1-2mm to spare

If you try to put a 15mm drive in, you can see that it simply will not fit; the pins that go into the drive’s screw holes are too far away:

attempting to fit a 15mm drive in the 9020m caddy
15mm drives do not fit the caddy

However, if you didn’t use the caddy, a 15mm will physically fit in the machine with 1-2mm to spare on the top:

But then you are entirely relying on the SATA connector to hold it it place while it rests on the locking bracket of a heatstink from below; not exactly a secure way to attach a hard drive:

heatsink locking bracket a 15mm drive would rest on

That all said, one could theoretically fabricate a new drive caddy such that there’s no part of the caddy that is on top of the drive (or at most, 1-2mm). For example, instead of the bulk of the caddy support being on top of the drive, make it be from the bottom of the drive. But, that’s a bit our of my realm of DIY/3D printing skills, so alas I’m out of luck.

Wrap Up

The max drive height for a Dell Optiplex 9020M Micro is 9mm and 12.5mm or 15mm drives are simply too tall to fit in the drive caddy. One workaround would be to 3D design and print your caddy such that it only supports the drive from the bottom, since the issue is the thickness of the top of the existing caddy. For now, I’ll just keep the 15mm drive in the external USB enclosure and velcro it to the chassis.

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