Fixing Windows Installation Error 0x800701B1

WHAT DOES ERROR 0x800701B1 MEAN?
Error 0x800701B1 during Windows installation usually means Setup has lost communication with the storage device. In simple terms, Windows can see the drive one moment and then struggles to access it the next.

COMMON CAUSES
- Failing SSD or HDD
- Corrupted partition table
- Missing storage controller drivers
- Incorrect SATA/NVMe controller settings in BIOS
- Faulty SATA cable (desktop PCs)
- Defective USB installer or problematic USB port

FIRST STEPS TO CHECK
At the Windows installation screen ('Where do you want to install Windows?'):

- Press Shift + F10 to open Command Prompt
- Type: diskpart
- Type: list disk

Take note of:
- How many drives are detected
- The size of each drive
- Whether your SSD or HDD appears in the list

IF THE DRIVE IS DETECTED
Try cleaning and rebuilding the partition table:

- select disk 0
- clean
- convert gpt
- exit

(Replace '0' with the correct disk number if necessary.)

Afterward, close Command Prompt, click Refresh, and check if the drive appears as Unallocated Space.

IF THE CLEAN COMMAND FAILS
If DiskPart reports errors such as:
- 'A device which does not exist was specified'
- 'The request could not be performed because of an I/O device error'

Windows is likely losing communication with the drive.

WHAT THIS USUALLY INDICATES
- The SSD or HDD may be failing
- A SATA cable may be loose or damaged
- The storage controller may require drivers
- BIOS storage settings may be incorrect
- The Windows installation USB may be corrupted
.