Welcome to the Dell Community  @DFCosta 

Go to "Disk Manager" and see how the drive is partitioned.

The partitions should total 931.32GB if you have a 1TB drive installed.

Best regards,

NOTE: What model HDD do you have installed???

Thanks! It appears I was under the wrong impression ... I seem to have 256 SSD. How can I check out what's taking up the space? I barely used this laptop and cant understand how this space is being taken up.

@DFCosta 

Look under "Disk Manager"

There could be 3, 4, or more partition's

(EFI) Partition

(System) Partition

(OEM) Partition

(Recovery) Partition

(OS) Partition

They should add up to around 238.4186 GB

Regards,

U2

NOTE: A 256GB HDD after it is formatted will be around 238.4186 GB

@Mary G 

Did you do any research before posting???

I did.

Would you please tell me where it says that this laptop model comes with a M.2 interface and a SATA  interface???

Inspiron 15 3000 Setup and Specifications:

https://www.dell.com/support/manuals/us/en/04/inspiron-15-3567-laptop/inspiron-15-3567-setup-specifications/set-up-your-computer?guid=guid-f97ffcef-edd9-45aa-a8d3-d2252ed0025d&lang=en-us

There is one M.2 slot for Wi-Fi/Bluetooth:

Inspiron 15 3000 Service Manual:

You have 2 drives--the ssd and a 1 tb hard drive most likely named Drive D. That should be used for all files and programs while the small ssd is for the Windows system and essential system files to speed up booting. You have to manually select Drive D as your download and program installation drive because the default drive is always C.