Partition 1 does not start on physical sector boundary

My Cloud Home - Personal Cloud Storage My Cloud Home
1

Greetings,
I updated my 1st Gen WD MyCloud NAS from a 4Tb to an 8Tb drive awhile back and didn’t notice this issue until recently. I’m getting the “Partition 1 does not start on physical sector boundary.” error from fdisk. Does anyone know if there is a way to align the partition correctly or will I need to start over from scratch and rebuild the system again? The system has been a bit unstable (sometimes it doesn’t boot up correctly and takes a couple tries to get it running) it was not unstable before I replaced the drive.

Thanks for any info!

Here’s the output I’m getting from the “fdisk -l” command:

MyCloud:~# fdisk -l

WARNING: GPT (GUID Partition Table) detected on ‘/dev/sda’! The util fdisk doesn’t support GPT. Use GNU Parted.

Disk /dev/sda: 8001.6 GB, 8001563222016 bytes
255 heads, 63 sectors/track, 972801 cylinders, total 15628053168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x00000000

Device Boot Start End Blocks Id System
/dev/sda1 1 4294967295 2147483647+ ee GPT
Partition 1 does not start on physical sector boundary.

Disk /dev/md1: 2047 MB, 2047803392 bytes
2 heads, 4 sectors/track, 499952 cylinders, total 3999616 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x00000000

Disk /dev/md1 doesn’t contain a valid partition table

2

@superswade

Do you own a My Cloud Home? Here is a link for the User Manual.
WD Documentation (wdc.com)

3

Hi cat0w, Mine’s similar to those but older. It’s 1st Gen c.2014 or so.

4

@superswade

Is it the My Cloud or My Cloud Mirror? What Firmware does it have? Is it OS3?

The image below is from my first generation WDMYCLOUD OS3. It is in use on my home network.

image

5

There is no error here. Fdisk is mistakenly attempting to interpret the dummy GPT Protective MBR and Partition Table as a real partition table.

https://thestarman.pcministry.com/asm/mbr/GPT.htm

6

Hi cat0w,
The firmware is v.04.06.00-111 (I believe that is the last one they made for these devices).

image

7

Thanks for the info fzabkar. So you think this is normal for these devices? Here’s the output of “fdisk -l” command. The fact that it starts at sector 1 concerned me, I thought it should be 0 or 2048? This is fdisk’s info thought so maybe erroneous since it doesn’t even support GPT partitions.

image
image894×403 12.8 KB

8

https://thestarman.pcministry.com/asm/mbr/GPT.htm

the next three bytes (“00 02 00”) indicate the partition starts at CHS (0,0,2) or Absolute Sector 1 (this is where the GPT Header is located)

1 Like
9

Thanks fzabkar! Everything seems to be normal with the drive so I’ll just be keeping it as it is.