Drive missing from Optimize Drives since upgrade to Windows 10 1803

Since upgrading Windows 10 (Pro) to version 1803, one of my drives is missing from the Optimize Drives list. The drive in question is, my D:-drive, a software-defined RAID-0 (striped) over two disks.

What is wrong with my drive, and how can I make it show up again? Or is this possibly a bug in Windows 10 version 1803?

The drive is present in Disk Management:

Attempting to invoke defrag from the (administrator) command prompt does nothing:

C:\WINDOWS\system32>defrag D: /A
Microsoft Drive Optimizer
Copyright (c) Microsoft Corp.
C:\WINDOWS\system32>

In contrast, specifying a drive that doesn't exist yields error "The given volume path is invalid. (0x89000001)" (and usage instructions), and specifying one of the other existing drives does work.

I have looked at the event viewer, but I did not see anything that I could link to this problem.

Attempting to do this from PowerShell (run as administrator) results in:

C:\WINDOWS\system32> Optimize-Volume -DriveLetter D -Analyze -Verbose
VERBOSE: Invoking analysis on Data (D:)...
Optimize-Volume : This volume cannot be optimized.
Activity ID: {8f3adaf8-67ea-4239-a659-1eec6745ec27}
At line:1 char:1
+ Optimize-Volume -DriveLetter D -Analyze -Verbose
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : NotSpecified: (StorageWMI:ROOT/Microsoft/...age/MSFT_Volume) [Optimize-Volume], CimExcep tion + FullyQualifiedErrorId : StorageWMI 43025,Optimize-Volume

When I list my drives in diskpart, one of the disk of this volume is listed with status Errors, and the volume as 'At Risk':

D:\>diskpart
Microsoft DiskPart version 10.0.17134.1
Copyright (C) Microsoft Corporation.
On computer: RAMONA
DISKPART> list disk Disk ### Status Size Free Dyn Gpt -------- ------------- ------- ------- --- --- Disk 0 Errors 465 GB 1024 KB * Disk 1 Online 465 GB 1024 KB * Disk 2 Online 238 GB 0 B Disk 3 Online 931 GB 0 B *
DISKPART> list volume Volume ### Ltr Label Fs Type Size Status Info ---------- --- ----------- ----- ---------- ------- --------- -------- Volume 0 D Data NTFS Stripe 931 GB Healthy At Risk Volume 1 E DVD-ROM 0 B No Media Volume 2 System Rese NTFS Partition 350 MB Healthy System Volume 3 C NTFS Partition 237 GB Healthy Boot Volume 4 F Elements NTFS Partition 931 GB Healthy

I did a select volume 0 followed by a recover in diskpart, which reverted the status back to Online and cleared the At Risk state, but the drive did not show up in Optimize Drives (not even after a reboot).

A subsequent execution of chkdsk d: /f /x /r results in a single bad sector being found (which is not recoverable, probably because it is a striped volume). This marks the disk back in Errors and the volume to At Risk.

I have ordered a new disk to replace this RAID-0 config, if this new disk does show up correctly, I will assume that the problem is indeed caused by this bad sector, although it is unclear to me why the diskpart recover (which cleared the error state) did not make the volume visible again. There must be something more to this.

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