Is Your Storage Drive An SSD Or An HDD?

Today’s article aims to answer a simple question, simply is your storage drive an SSD or an HDD? This is not something most folks will have trouble knowing, but it’s still something worth knowing how to do. After all, you never know when you’ll be attached to a remote computer with disks of different types.

And, yes, due to expense and sizes, HDDs still exist and are still in use all over the place. Not everything has been converted to an SSD.

We’ve relied on spinning media for quite some time. We used this in hard disk drives. They were the norm for many years. SSDs (solid-state drives) are more common in end-user computers these days. If you can, you might even have an NVME SSD which is exceptionally fast.

We’re only going to use one command in this article, so it will be quite short. That’s not a bad thing. Not every article needs to be all that long.

We’ll simply be using the cat command. We’ve used this command many times in the past because it’s a handy command to use!

cat:

The cat command is a command used in the terminal. We want to read a file and cat is the correct tool for the job. The cat command reads a file and sends the output to the terminal. You won’t need to install anything.

Let’s check the man page (with man cat) to see:

cat – concatenate files and print on the standard output

See? If we want to read a file to the terminal, this is the correct tool for the job. Again, you won’t need to install anything.

An SSD Or An HDD:

Like oh so many articles, you will need an open terminal. Just press CTRL + ALT + T and your default terminal should open.

With your terminal open, let’s see if you’ve got an SSD or an HDD.

First, identify your drives with this command:

lsblk

Now, ignoring the partitions, you can run the following command:

cat /sys/block/<drive_ID>/queue/rotational

So, for example, you’d run this command:

cat /sys/block/sda/queue/rotational

And here’s an example output:

$ cat /sys/block/sda/queue/rotational
0

The zero means that it’s an SSD. 

If we run this command against a drive that I know is an HDD (a plugged-in external HDD that’s used for backups and storage):

$ cat /sys/block/sdb/queue/rotational
1

The 1 means that it is a spinning HDD.

So, if you have both you can now distinguish between an SSD and an HDD.

Closure:

So, now you know how to tell if your device is an SSD or an HDD. This is something easily determined. If you have questions about your storage, this will help answer those questions. I’m not sure that I’d memorize this command, but it’s worth adding to your notes.

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