Windows 10: unable to see volume contents, unable to bring volumes online

I am not sure if I have this in the correct forum - please let me know if it should be elsewhere.

I have W7-64 installed on an MBR SATA SSD, and in use for several years. This disk has 2 partitions, one system & the other one is data.
Now I have installed W10-64 1909 on a GPT NVMe SSD on the same system in a UEFI dual boot setup. (I unplugged all other disks while installing W10)
This is functioning, it can boot cleanly into either one.
(BTW there are two other GPT data mechanical drives in the system, no problem accessing them)

At first, I could see both SSD disks from both systems. Now, I cannot see the W7 disk contents from W10 (the other way still works). W10 can see that the other disk is there, but it cannot see its contents. Drive letters are assigned. In windows explorer, the disk contents are blank (while I know they are not blank).

Using diskpart on the W10 system, I noticed that the disks are all online, but the 2 volumes of the W7 SSD are offline. I tried to bring them online by selecting them and then applying the diskpart Online command, but diskpart responds:
"diskpart could not online the selected volume"

Why not? How do I fix this?

Thank you in advance.

:)

 

unable to see volume contents, unable to bring volumes online

I am not sure if I have this in the correct forum - please let me know if it should be elsewhere.

I have W7-64 installed on an MBR SATA SSD, and in use for several years. This disk has 2 partitions, one system & the other one is data.
Now I have installed W10-64 1909 on a GPT NVMe SSD on the same system in a UEFI dual boot setup. (I unplugged all other disks while installing W10)
This is functioning, it can boot cleanly into either one.
(BTW there are two other GPT data mechanical drives in the system, no problem accessing them)

At first, I could see both SSD disks from both systems. Now, I cannot see the W7 disk contents from W10 (the other way still works). W10 can see that the other disk is there, but it cannot see its contents. Drive letters are assigned. In windows explorer, the disk contents are blank (while I know they are not blank).

Using diskpart on the W10 system, I noticed that the disks are all online, but the 2 volumes of the W7 SSD are offline. I tried to bring them online by selecting them and then applying the diskpart Online command, but diskpart responds:
"diskpart could not online the selected volume"

Why not? How do I fix this?

Thank you in advance.

 

Unable to Shrink Volume

As far as MiniTool showing more partitions, actually, Disk Management is showing less partitions. MiniTool shows the full picture, whereas Disk Management shows a partial picture, omitting those partitions that are not Fat32 nor NTFS.

 

upgrading SSD unable to boot into Windows10 (EFI volume hidden)

Hi,

I am unable to boot into windows 10 after completing the installation successfully. PC is HP Prodesk G3 small form factor (business PC)

All files are being written to the SSD but just can not boot. The disk is GPT and secure boot is enabled. I am unable to find an option for AHCI in bios so hope its set correctly.

Startup repair returns (couldnt repair your PC) > C:\windows\system32\logfiles\srttrail.txt

Disk Part shows a 100MB volume listed as FAT32 which is the EFI volume and I am guessing that becasue this volume is hidden the PC is unable to use boot manager? When attemptimg to boot afer install it does list UEFI: Windows Boot Manager , but only a black screen after.

Would really appreciate assistance in sorting this as I am trying to upgrade.