I bought a computer and I installed Windows 10. I bought it with 256 GB of SSD and 1000 GB of HDD. I installed the OS on the SSD. When I installed it, the operation system can't find my hard disk. I tried to run diskpart and got the following result:

```
DISKPART> list disk
  Disk ###  Status         Size     Free     Dyn  Gpt
  --------  -------------  -------  -------  ---  ---
* Disk 0    Online          931 GB      0 B        *
  Disk 1    Online          238 GB      0 B        *

DISKPART> select disk 0
Disk 0 is now the selected disk.

DISKPART> list partition
  Partition ###  Type              Size     Offset
  -------------  ----------------  -------  -------
  Partition 1    System              62 MB  1024 KB
  Partition 2    Unknown           1024 KB    63 MB
  Partition 3    Unknown            927 GB    64 MB
  Partition 4    Unknown           4095 MB   927 GB

```

This is the result for the SSD (which is working):

```
DISKPART> select disk 1
Disk 1 is now the selected disk.

DISKPART> list partition
  Partition ###  Type              Size     Offset
  -------------  ----------------  -------  -------
  Partition 1    Reserved            16 MB  1024 KB
  Partition 2    Primary            238 GB    17 MB

```

Disk management:

[disk managment](https://i.stack.imgur.com/Esmvf.png)

When I tried to assign a disk letter to the first disk I saw disk with 60MB (the size of the first partition) and not 1000 GB (the real size of the disk). How can I assign a disk letter to specific partition (the third partition)?

```
DISKPART> list volume

  Volume ###  Ltr  Label        Fs     Type        Size     Status     Info
  ----------  ---  -----------  -----  ----------  -------  ---------  --------  
  Volume 0                      FAT    Partition     62 MB  Healthy    System
  Volume 1     C                NTFS   Partition    238 GB  Healthy    Boot

DISKPART>

```

I'd be happy to get help!

**Edit:**
In Disk Managment I can't choose the "Format" option.

[Can't choose options](https://i.stack.imgur.com/qFC7p.png)