(01-28-2026, 11:17 PM)admin Wrote: Technically, 4GB should be sufficient, but we have encountered a user who created an ISO that actually exceeded 4GB, so please check the size of the ISO file if there is a memory error.
Also, can you provide the log files generated under WinPE in two cases?
MBR system Backup Checkbox Inactive Log
HBS was unable to locate a partition containing the BCD file on this virtual machine. Are you sure there is a bootable Windows operating system on this VM? Is the Windows version Vista or later?
Yesterday, 03:59 PM (This post was last modified: Yesterday, 04:02 PM by nkptext123.)
(Yesterday, 11:48 AM)admin Wrote:
(Yesterday, 01:01 AM)nkptext123 Wrote: MBR system Backup Checkbox Inactive Log
HBS was unable to locate a partition containing the BCD file on this virtual machine. Are you sure there is a bootable Windows operating system on this VM? Is the Windows version Vista or later?
Yes, this operating system is bootable, and Win 10 Enterprise LTSC installed, but the partition style is MBR. My friend has the same problem as mine This problem occurs only in MBR systems.
Yesterday, 10:52 PM (This post was last modified: Yesterday, 10:54 PM by admin.)
(Yesterday, 03:59 PM)nkptext123 Wrote:
(Yesterday, 11:48 AM)admin Wrote: HBS was unable to locate a partition containing the BCD file on this virtual machine. Are you sure there is a bootable Windows operating system on this VM? Is the Windows version Vista or later?
Yes, this operating system is bootable, and Win 10 Enterprise LTSC installed, but the partition style is MBR. My friend has the same problem as mine This problem occurs only in MBR systems.
This is really strange. Could you check if there is a BCD file in the Boot folder within the partition marked as Active and System on Disk 0? You might need to manually assign a drive letter to that partition.
Or did you boot Windows from that disk in UEFI mode? I suspect this might be the case for you.
(Yesterday, 03:59 PM)nkptext123 Wrote: Yes, this operating system is bootable, and Win 10 Enterprise LTSC installed, but the partition style is MBR. My friend has the same problem as mine This problem occurs only in MBR systems.
This is really strange. Could you check if there is a BCD file in the Boot folder within the partition marked as Active and System on Disk 0? You might need to manually assign a drive letter to that partition.
Or did you boot Windows from that disk in UEFI mode? I suspect this might be the case for you.
I am using a hyper v environment and unable to access uefi mode bios settings and in my device's HBS works in Windows mode without problems, but Winpe mode checkboxes are deactivated.
in my thinking hbs unable find boot drive in mbr mode only in winpe mode
Today, 01:12 AM (This post was last modified: Today, 01:17 AM by admin.)
(Today, 12:19 AM)nkptext123 Wrote:
(Yesterday, 10:52 PM)admin Wrote: This is really strange. Could you check if there is a BCD file in the Boot folder within the partition marked as Active and System on Disk 0? You might need to manually assign a drive letter to that partition.
Or did you boot Windows from that disk in UEFI mode? I suspect this might be the case for you.
I am using a hyper v environment and unable to access uefi mode bios settings and in my device's HBS works in Windows mode without problems, but Winpe mode checkboxes are deactivated.
in my thinking hbs unable find boot drive in mbr mode only in winpe mode
Please check if there is a BCD file in the boot folder (boot\bcd).
If possible, please use HBS to back up this partition (which does not contain your personal information or sensitive data), and then send the backup image file to us.
(Today, 12:19 AM)nkptext123 Wrote: I am using a hyper v environment and unable to access uefi mode bios settings and in my device's HBS works in Windows mode without problems, but Winpe mode checkboxes are deactivated.
in my thinking hbs unable find boot drive in mbr mode only in winpe mode
Please check if there is a BCD file in the boot folder (boot\bcd).
If possible, please use HBS to back up this partition (which does not contain your personal information or sensitive data), and then send the backup image file to us.
But this virtual machine runs gen 2 UEFI-based firmware.
And it's installed in MBR style.
If win10 gpt style is installed, hbs checkboxes works in winpe mode.
Hbs checkboxes not recognize if uefi firmware is installed, but the drive is mbr ?
What is the issue?
3 hours ago(This post was last modified: 3 hours ago by admin.)
(9 hours ago)nkptext123 Wrote:
(Today, 01:12 AM)admin Wrote: Please check if there is a BCD file in the boot folder (boot\bcd).
If possible, please use HBS to back up this partition (which does not contain your personal information or sensitive data), and then send the backup image file to us.
But this virtual machine runs gen 2 UEFI-based firmware.
And it's installed in MBR style.
If win10 gpt style is installed, hbs checkboxes works in winpe mode.
Hbs checkboxes not recognize if uefi firmware is installed, but the drive is mbr ?
What is the issue?
Regarding the 2nd issue, we checked the image file you sent and found that the boot\bcd file indeed does not exist, which means that you are indeed booting Windows from this drive in UEFI mode. We will implement support for this situation as soon as possible.
Regarding the 1st issue, have you checked the size of the WinPE ISO file?
Regarding this issue, it seems to be a bug in Hyper-V. Although the virtual machine is configured with 4GB of memory, Hyper-V sometimes only allocates about 1GB of memory to the virtual machine, and this happens quite frequently.
As shown in the screenshot, the available memory is actually only 181MB, in which case the program will have difficulty functioning properly.
![[Image: 1111.jpg]](https://www.upload.ee/image/19032207/1111.jpg)
![[Image: 222.jpg]](https://www.upload.ee/image/19032208/222.jpg)
![[Image: 3333.jpg]](https://www.upload.ee/image/19032210/3333.jpg)
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