Use DiskPart to Create the OS Partition on Clean Install.

I have a Laptop HDD [ my preferred option as opposed to an SSD on this Laptop ] arriving on Friday and I want to use DiskPart to Setup the size of the OS Partition. The main reason I want to do it this way is because DiskPart can create an exact 30 GB Partition [ my OCD ] for example. Here are the steps that I tried the other day which did NOT work . . .

• Boot from the install USB.
• On the Windows Installation Screen press Shift + F10.
• diskpart
• list disk
• select disk 0
• clean
• create partition primary size=30000
• exit
• exit

I intend to leave assign AND format fs=ntfs for Windows to perform as normal during the installation.

Thanks.

SIW2 said:

If you are using windows setup, you would be better creating the partitioning that setup is happy with.

If your example above is for mbr, mark the 30gb partition active.

For gpt, you could use diskpart to create at least the esp partition as well as your 30gb

Yes, it is MBR.

Like this . . .

• diskpart
• list disk
• select disk 0
• clean
• create partition primary size=30000
• Active
• format fs=ntfs
• exit
• exit

Matthew Wai said:

Code:

Microsoft Windows [Version 10.0.19042.746]
(c) 2020 Microsoft Corporation. All rights reserved.

C:\Windows\system32>DiskPart

Microsoft DiskPart version 10.0.19041.610

Copyright (C) Microsoft Corporation.
On computer: DESKTOP

DISKPART> List Disk

  Disk ###  Status         Size     Free     Dyn  Gpt
  --------  -------------  -------  -------  ---  ---
  Disk 0    Online          465 GB      0 B        *
  Disk 1    Online           60 GB      0 B
  Disk 2    Online         7388 MB      0 B
  Disk 3    No Media           0 B      0 B
  Disk 4    Online           28 GB      0 B

DISKPART> Select Disk 1

Disk 1 is now the selected disk.

DISKPART> Clean

DiskPart succeeded in cleaning the disk.

DISKPART> Convert MBR

DiskPart successfully converted the selected disk to MBR format.

DISKPART> Create partition primary size=30000

DiskPart succeeded in creating the specified partition.

DISKPART> Active

DiskPart marked the current partition as active.

DISKPART> Detail Disk

MI XMUP01QM USB Device
Disk ID: 0EBAC1E0
Type   : USB
Status : Online
Path   : 0
Target : 0
LUN ID : 0
Location Path : UNAVAILABLE
Current Read-only State : No
Read-only  : No
Boot Disk  : No
Pagefile Disk  : No
Hibernation File Disk  : No
Crashdump Disk  : No
Clustered Disk  : No

  Volume ###  Ltr  Label        Fs     Type        Size     Status     Info
  ----------  ---  -----------  -----  ----------  -------  ---------  --------
* Volume 5     T                RAW    Removable     29 GB  Healthy

DISKPART> List partition

  Partition ###  Type              Size     Offset
  -------------  ----------------  -------  -------
* Partition 1    Primary             29 GB  1024 KB

DISKPART>

Brilliant, thanks Matthew.

What would the MBs be then to get EXACTLY 30 GBs?
Something like 30480 MBs?

Matthew Wai said:

1024 ✖ 30 ＝30720

BTW, the USB device shown in my above post contained three files, all of which have been recovered by DiskGenius from the RAW partition.

OK, thanks.

I wondered why it was NOT exactly 30 GBs. I think there are two standards for this, one being Decimal and the other being Binary.

I found this => GB to MB Conversion

From your above post, DiskPart uses Decimal then.

If DiskPart uses Binary, then the answer is 30000 MB.
If DiskPart uses Decimal, then the answer is 30720 MB.

Is there nothing else to Add for the Reserved / Recovery Partition?