Can't back-up, Error 0xb042f: Destination is unavailable.

This happened 2 times.
First time when I went to check the M: drive it was not 'connected'? USB drive, and I disconnected the cable, and it didn't return? Disconnected the power and when I plugged it back in, it came back. Started the back-up again, but it failed with the same error.
First time it wrote 190GB's to the drive, this time 201GB's?
This 2nd time the drive always was 'there', able to access it after the fail.
Also ran CHKDSK /F on ALL drives with no errors?
Ran SFC /SCANNOW and used DISM to SCANHEALTH with NO problems found?
When I restarted the backup I did NOT delete the partial failed file and it started to use the same name.
Log entry:
======================
2021-01-20T23:14:55:008-05:00 16224 E000B042F: Error 0xb042f: Destination is unavailable.
| trace level: error
| line: 0x5d5406763c32a94
| file: c:\bs_hudson\workspace\123\products\imager\archive\impl\operations\utils.cpp:582
| function: TrueImage::Archive::MakeDestinationUnavailableError
| line: 0x5d5406763c32a94, c:\bs_hudson\workspace\123\products\imager\archive\impl\operations\utils.cpp:582, TrueImage::Archive::MakeDestinationUnavailableError
| Path: M:\Acronis Backup\All_Drives\
| StrId: \local\hd_ev\vol_guid(F43039904D315EA7B59CAA8B53A01D31)
| $module: ti_demon_vs_25700
|
| error 0x2160015: A backup error.
| line: 0xa340ffd3416335cf
| file: c:\jenkins_agent\workspace\mod-disk-backup\650\product\core\da_api\backup.cpp:353
| function: da_backup::Commit
| line: 0xa340ffd3416335cf, c:\jenkins_agent\workspace\mod-disk-backup\650\product\core\da_api\backup.cpp:353, da_backup::Commit
| $module: disk_backup_vs_650
|
| error 0x29b138d: Input/output error
| line: 0x30ba355f9fd4ffbd
| file: c:\jenkins_agent\workspace\mod-disk-backup\650\product\core\resizer\archive3\utils.cpp:364
| function: `anonymous-namespace'::ArchiveWriterImpl::CoroutineFunc
| line: 0x30ba355f9fd4ffbd, c:\jenkins_agent\workspace\mod-disk-backup\650\product\core\resizer\archive3\utils.cpp:364, `anonymous-namespace'::ArchiveWriterImpl::CoroutineFunc
| function: archive_stream_write_shbuf
| path: \\?\M:\Acronis Backup\All_Drives\/LARAINE-C, D, and E.tibx
| $module: disk_backup_vs_650
|
| error 0xfff0: The device is not ready.
|
| line: 0x30ba355f9fd4ffbd
| file: c:\jenkins_agent\workspace\mod-disk-backup\650\product\core\resizer\archive3\utils.cpp:364
| function: `anonymous-namespace'::ArchiveWriterImpl::CoroutineFunc
| line: 0x30ba355f9fd4ffbd, c:\jenkins_agent\workspace\mod-disk-backup\650\product\core\resizer\archive3\utils.cpp:364, `anonymous-namespace'::ArchiveWriterImpl::CoroutineFunc
| function: pcs_co_file_readv
| path: \\?\M:\Acronis Backup\All_Drives\LARAINE-C, D, and E-0064.tibx
| code: 0x80070015
| $module: disk_backup_vs_650
2021-01-20T23:14:55:095-05:00 16224 E013C0005: Error 0x13c0005: Operation has completed with errors.
| trace level: error
| line: 0x9f2c53c72e8bced8
| file: c:\bs_hudson\workspace\123\products\imager\demon\main.cpp:738
| function: main
| line: 0x9f2c53c72e8bced8, c:\bs_hudson\workspace\123\products\imager\demon\main.cpp:738, main
| $module: ti_demon_vs_25700
============================
Dir of the back-up folder:
==========
M:\Acronis Backup\All_Drives>dir
Volume in drive M is My Book
Volume Serial Number is 3476-64FD
Directory of M:\Acronis Backup\All_Drives
01/20/2021 10:00 AM <DIR> .
01/20/2021 10:00 AM <DIR> ..
12/24/2020 01:03 AM 586,436,857,856 LARAINE-C, D, and E-0060.tibx
12/31/2020 05:30 AM 590,278,176,768 LARAINE-C, D, and E-0061.tibx
01/07/2021 01:57 AM 589,829,255,168 LARAINE-C, D, and E-0062.tibx
01/14/2021 01:41 AM 588,181,671,936 LARAINE-C, D, and E-0063.tibx
01/20/2021 11:13 PM 205,986,201,600 LARAINE-C, D, and E-0064.tibx
10/23/2019 02:01 PM 12,288 LARAINE-C, D, and E.tibx
6 File(s) 2,560,712,175,616 bytes
2 Dir(s) 1,044,912,332,800 bytes free
===========
Suggestions? Should I delete the failed back-up before trying again?

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Irv, one of the concerns over using drive letter M: with any version of ATI that includes the option for doing Mobile Backups is that Acronis automatically use the same drive letter M: for their Acronis Drive used by Mobile Backup!
I would suggest using Windows Disk Management to allocate a different drive letter, i.e. N: to your backup drive, then reselect the Destination for your backup task using the new letter to see if this makes any difference?
One thing I noticed a short time ago when doing some testing on other issues, is that Acronis will allow a mobile backup to run simultaneously with a regular backup, such that there were 2 system tray icons both showing progress of the 2 backup tasks! This could cause problems if both tasks were trying to both use the same drive M: !!
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Acronis Links : Acronis Scheduler Manager : Acronis VSS Doctor : Backup Archive Compatibility : Cleanup Tool (All versions) : Cloning Disks : Contact Acronis Support : Difference between Backup and Disk Clone : Repair program / settings
MVP Assistant (Log Viewer) latest version see pinned topic in ACPHO forum page.
MVP Custom PE Builder available from Community Tools page.
Acronis True Image User Guides available from Product Documentation page.
imTranslator for quick translation of language posts.

Steve, seems I hit a 'snag'? Change the drive letter and tried to add the old backups, no go:
Need advice? Start over fresh and save the old backups somewhere else (I have some space and probably only need the oldest one or two...
Never had a problem before with this M: drive letter and never used the mobile backup?
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Irv, there shouldn't be any need to add any existing backups after changing the drive letter, just click on the Destination for the backup task and reselect the backup storage location on the new drive letter.
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Acronis Links : Acronis Scheduler Manager : Acronis VSS Doctor : Backup Archive Compatibility : Cleanup Tool (All versions) : Cloning Disks : Contact Acronis Support : Difference between Backup and Disk Clone : Repair program / settings
MVP Assistant (Log Viewer) latest version see pinned topic in ACPHO forum page.
MVP Custom PE Builder available from Community Tools page.
Acronis True Image User Guides available from Product Documentation page.
imTranslator for quick translation of language posts.

Steve,
I didn't try that, but I took a different path.
I ran the WD Utility to check the drive. It failed all but the SMART test... so I took it to my PC.
It failed as well... and I was leaving the cables and power supplies on each PC. Check my Drive Utilities and discovered I had an older version, an 8/2020 was available and installed it on my PC with her drive:
As you can see, it might be a DRIVE problem. Matter of fact, when I closed the old version and first ran the new version it couldn't find the drive? However once I opened File Explorer it did reconnect and I could run the utility and as you can see, it can see the drive.
Much to my amazement, my same model drive on her PC is now working. Too soon to say for sure, as only 110Gb's, not hit the ~200Gb's the other drive failed at, but it is also MUCH faster in time. Before, her drive took about 12 - 14 hr's to create a backup. It started showing time as around a day + and slowly decreased when writing. Now, with 110Gb's written it is showing ~4 hours to go. MUCH faster.
Another reason to think it was a drive problem, the USB port used is shared with another port, and she had a problem with a device on that port starting last week. Also, today, thinking it was a PC USB port problem I moved the drive to a new USB 3.0 only card I put in her PC. It has 3 ports and one was used by a network USB adapter. Once I plugged the drive in, the network adapter stopped working!!!
So, that is when I tested the drive on her PC, and saw the same fails I posted above. Swapped drives, and it seems my drive on her PC is working (will know if the backup completes in a few hours).
We checked our records and the WDC site. We got that drive in late 2019... and I know why. Her old drive BROKE... when I dropped it and it was replaced under warranty.
What I suspect is I might have gotten a refurbished unit even, and, because of what I think is a speed write difference, it might have a USB 3.0 problem internally? I think at one time I might have posted here that my backups, although only 1/2 the size of hers normally take 1/4 of the time. This might explain that even?
We did buy another WD 4Tb drive today. I've not even opened the box in case I discover the problem is on her PC so I could return it, but right now, I strongly suspect the drive.
I'm not even going to bother and find programs (I probably have one) that can test the drive (CHKDSK /F found no problems?) fully, it isn't worth it. I can ERASE all data (I hope) and RMA it and use the NEW one we bought and have a backup that way.
Once I know the REAL Answer, I'll post back.
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Irv, the WD Data Lifeguard utility should tell you if the drive is going bad, which it sounds most likely is the case from your comments above.
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Acronis Links : Acronis Scheduler Manager : Acronis VSS Doctor : Backup Archive Compatibility : Cleanup Tool (All versions) : Cloning Disks : Contact Acronis Support : Difference between Backup and Disk Clone : Repair program / settings
MVP Assistant (Log Viewer) latest version see pinned topic in ACPHO forum page.
MVP Custom PE Builder available from Community Tools page.
Acronis True Image User Guides available from Product Documentation page.
imTranslator for quick translation of language posts.

Steve Smith wrote:Irv, the WD Data Lifeguard utility should tell you if the drive is going bad, which it sounds most likely is the case from your comments above.
Steve, no, not for the My Book's. Use the Drive Utilities. However I did d/l them and tried:
Drive I'm pretty sure has problems. It even 'comes and goes connected' on my PC as well.
Also, in less than 5 hours the backup of a 520Gb backup file finished and seems OK on my wife's PC.
That is less than 1/2 the time it took to do the same backup with the drive that is giving us problems now.
Still 2 years to go on the Warranty, back it goes. Hope I can ERASE it though...
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Steve Smith wrote:Irv, the WD Data Lifeguard utility should tell you if the drive is going bad, which it sounds most likely is the case from your comments above.
Steve, 100% sure the drive is bad now. Put my WD drive back on my PC and ran the Data Lifeguard Quick Test. Passed:
It passed, not like the other drive which failed immediately. This one took almost 3 minutes.
Back the drive goes!
Thanks.
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Steve Smith wrote:Irv, the WD Data Lifeguard utility should tell you if the drive is going bad, which it sounds most likely is the case from your comments above.
Steve, I sent the drive back, and they just got it today...
In the mean time I bought the same drive for my wife so she'd not miss a back-up. New drive, it took 6 hours, old drive up to 13 hours. Suspect the USB 3.0 internal chips had a problem or there was errors and retries.
Now the new drive seems to be taking longer (full backup creating a 550+/- file every time) by 2 or 3 hours?
Oh, and I *absolutely* hate WD and probably bought my last drive from them.
I go to register the new drive. Needed to scan my purchase receipt and upload it. Did that. Next day, checked to see if my RMA'ed drive was still in process and noticed the NEW DRIVE had 76 days left on the Warranty!!! What???
So I open an 'incident' on the web site and asked WHY my drive had less than 80 days... surely something was wrong, no? Supposed to be 3 years.
Well, the answers I got were absurd!!
#1
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- Includes the name, address and phone # of the company selling the product
- Date of purchase
- Description of the Western Digital drive with price, model/serial number
- Amount paid
- Method of payment
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