Adding a second drive and disk numbers


  1. Posts : 79
    Windows 10 Pro 64 bit
       #1

    Adding a second drive and disk numbers


    I recently built a PC with only an SSD. Now I added an HDD for storage. I thought before adding the HDD that the SSD was Disk 0 because it was the only drive. But after initializing the HDD it became Disk 0 and the SSD is now Disk 1. Is this normal behavior or did something go wrong?

    FWIW the SSD is the C: drive and the HDD is the D: drive.
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  2. cereberus's Avatar
    Posts : 12,395
    Windows10
       #2

    It really does not matter these days (and has not for many years unless very old hardware in some cases).

    It just depends which hardware slot they are connected to.

    When only one, it is always numbered 0 regardless of which slot it is connected to.

    Nothing to worry about.
    Last edited by cereberus; 01 Aug 2021 at 02:01.
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  3. Paul Black's Avatar
    Posts : 14,329
    Win 10 Pro 64-bit v1909 - Build 18363 Custom ISO Install
       #3

    Hello @Mike100,

    As mentioned above, it is NOT so much of an issue these days. Windows is very good at this sort of organisation. Disk Management or Mini Partition Tool - Portable are an excellent way to view the Disk structure, with the latter being excellent at Disk manipulation [ Create, Shrink, Format, Extend, Merge, Move, etc ].

    I hope this helps.
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  4. Try3's Avatar
    Posts : 9,210
    Windows 10 Home x64 Version 21H2 Build 19044.1237
       #4

    Mike100 said:
    Is this normal behavior or did something go wrong?
    Mike,

    Yes, it's commonplace.

    In my laptop I have an [M.2] SSD with the OS on it and an HDD for general storage. The SSD is Disk 1 and the HDD is Disk 0.
    As cerebus said, the disk numbering is determined by the connections in use.

    Denis
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  5. AddRAM's Avatar
    Posts : 4,299
    Windows 10 Pro x64 21H1
       #5

    As all have said, it doesn`t really matter.

    But you can check and make sure the SSD is connected to sata port #1 on the motherboard and the hard drive is connected to sata port #2

    I also believe it may have something to do with the driver you use for the SSD.
      My Computers

  6. MisterEd's Avatar
    Posts : 886
    Windows 10 Pro 64-bit v21H1
       #6

    With my ASUS motherboard it depends. Disk0 and Disk1 are reserved for SATA0 and SATA1 if used.

    Original configuration:
    2 SATA hard drives and 1 M.2 NVME SSD
    The boot drive was Disk 2 an M.2 NVME SSD on the motherboard
    Adding a second drive and disk numbers-disk1b.jpg

    Current configuration:
    2 M.2 NVME SSDs
    The boot drive was Disk 0 the M.2 NVME SSD on the motherboard
    Note Disk 1 was an M.2 NVME SSD on a PCIe card Adding a second drive and disk numbers-disk2b.jpg
      My Computers



  7. Posts : 79
    Windows 10 Pro 64 bit
    Thread Starter
       #7

    The M.2 NVME SSD for the OS & programs is in connector M2_1. There is also an M2.2. The HDD is connected to the SATA2 port on the mobo. They're numbered 2,3,4,5.
      My Computer


 

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