Cannot mount 5TB external USB disk GPT single partition NTFS

[lacyk]

I have 2TB maxtor external disk connected to mycloud for years without any issue. I have recently bought a 5TB WD disk. It came as a single partition FAT32, so the first thing I did I reformatted it in windows disk manager to NTFS. Not recognized by mycloud, unsupported file system error message appeared in webGUI log.

blkid was reporting:

dev/sdc1: LABEL=“Maxtor” UUID=“76E43FCCE43F8D7D” TYPE=“ntfs”
/dev/sdb1: PARTLABEL=“Microsoft reserved partition” PARTUUID=“3d541e73-f563-4c9b-951c-b54a6ccb75f0”
/dev/sdb2: PARTLABEL=“Basic data partition” PARTUUID=“2de90570-680b-4d98-97a3-2cf59f86be3b”

sdb is a new disk, sdc is the old one, correctly mounted:
/dev/sdc1 on /mnt/USB/USB2_c1 type ufsd (rw,nls=utf8,fmask=0,dmask=0,force,user_xattr)

OK, I noticed strange sdb1, so plugged disk back to windows, run diskpart, deleted both partitions, converted to GPT, created only one partition and formatted with explorer (right-click on a drive)
blkid now reports:
/dev/sdc1: LABEL=“Maxtor” UUID=“76E43FCCE43F8D7D” TYPE=“ntfs”
/dev/sdb1: UUID=“2EF851AFF85175D5” TYPE=“ntfs” PARTLABEL=“Basic data partition” PARTUUID=“e90bf66e-73d8-4f8d-81c1-5bdb7a796236” LABEL=“WD”

no joy in mounting, still the same error in dmesg:
ufsd:fill_super failed to mount sdb1: “unknown fs” ->-22

I plugged disk to windows again, started partitionwizard, deleted and recreated partition again.
blkid reports:
/dev/sdc1: LABEL=“Maxtor” UUID=“76E43FCCE43F8D7D” TYPE=“ntfs”
/dev/sdb1: UUID=“01D70AF8A59E6F70” TYPE=“ntfs” PARTLABEL=“Basic data partition” PARTUUID=“e90bf66e-73d8-4f8d-81c1-5bdb7a796236” LABEL=“WD”

and drive is successfully automounted!!!
/dev/sdc1 on /mnt/USB/USB2_c1 type ufsd (rw,nls=utf8,fmask=0,dmask=0,force,user_xattr)
/dev/sdb1 on /mnt/USB/USB1_b1 type ufsd (rw,nls=utf8,fmask=0,dmask=0,force,user_xattr)

Then I did probably a big mistake - I ejected disk from Mycloud WebGUI, connected back to windows and copied 300GB of data to it. After connecting back to Mycloud it was not mounted again and blkid says:
/dev/sdc1: LABEL=“Maxtor” UUID=“76E43FCCE43F8D7D” TYPE=“ntfs”
/dev/sdb1: PARTLABEL=“Basic data partition” PARTUUID=“a1e781f0-0af8-01d7-f8c0-f3507c85eb00”

as you can see partition information is completely gone.

I saw that this disk can be recognized in mycloud (hwvise) and it seems it’s just a matter of partition table formatting. Is there any consistent way to make 5TB GPT NTFS disk safely recognizable by mycloud? Can I somehow return back to partition header UUID and TYPE=“ntfs” information without deleting partition?

Firmware version is: 2.41.116

[Bennor]

@lacyk

Firmware version is: 2.41.116

Note that this subforum (OS5 My Cloud) typically discusses issues related to the v5.x firmware. Because you are using OS3 v2.x firmware you may want to see the specific OS3 subforum for your device where you may find more relevant information.

http://community.wd.com/c/network-attached-storage/9

Sometimes the My Cloud has issues with certain USB hard drives that have more than one partition. One solution is to remove all partition, create one single partition and format it for one of the supported formats that the v2.x firmware recognizes. Also if GPT is an issue as a troubleshooting step try reinitializing the drive to MBR and see if that helps. Some WD Knowledgebase articles that may (or may not) apply:

External USB Drive File Systems Supported on a My Cloud

Western Digital Support | Western Digital

External USB Drive Will Not Mount, Not Seen or Detected by a My Cloud

Western Digital Support | Western Digital

My Cloud Error Code 1121 Unsupported File System

Western Digital Support | Western Digital

[lacyk]

thank you,
the last link led me to solution - suggested WD tools found no issue with disk hardware, but didn’t see partition. Windows on my laptop saw partition as RAW. WD quick format surprisingly didn’t recognize drive.

So I put external disk to old win10 32-bit desktop via USB2.0 and viewed in minitools partitionwizard - it recognized partition as NTFS but with 100% used. I started partition scan&repair (it looks like it simply called chkdsk from windows, as native repair tool requires a paid license) - it recovered all 300gb of files and desktop started to see external disk correctly as NTFS with 300gb used space

After plugging to Mycloud it recognized it and automounted instantly:
blkid:
/dev/sdc1: LABEL=“Maxtor” UUID=“76E43FCCE43F8D7D” TYPE=“ntfs”
/dev/sdb1: LABEL=“WD” UUID=“01D70AF8A59E6F70” TYPE=“ntfs” PARTLABEL=“Basic data partition” PARTUUID=“a1e781f0-0af8-01d7-f8c0-f3507c85eb00”

mount:
/dev/sdc1 on /mnt/USB/USB2_c1 type ufsd (rw,nls=utf8,fmask=0,dmask=0,force,user_xattr)
/dev/sdb1 on /mnt/USB/USB1_b1 type ufsd (rw,nls=utf8,fmask=0,dmask=0,force,user_xattr)

So if I summarize it - no method embedded in windows 10 was able to format 2TB+ disk for My Cloud, only free edition of partitionwizard was able to. Windows corrupted partition table on disk, but chkdsk was able to recover it back to state recognizable by My Cloud.