parted: Error: /dev/mmcblk0boot1: unrecognised disk label

stf92 · 12-08-2018, 11:53 AM

Hi:

Code:

root@darkstar~# parted -l
Model: MMC S10032 (sd/mmc)
Disk /dev/mmcblk0: 30.6GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags: 

Number  Start   End     Size    Type     File system  Flags
 1      1049kB  16.0GB  16.0GB  primary  ext2
 2      16.0GB  30.6GB  14.6GB  primary  ext2


Error: /dev/mmcblk0boot0: unrecognised disk label
Warning: Error fsyncing/closing /dev/mmcblk0boot0: Input/output error
Retry/Ignore?

While the print command within parted gives no errors!

Code:

root@darkstar~# parted
GNU Parted 3.2
Using /dev/mmcblk0
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) p                                                                
Model: MMC S10032 (sd/mmc)
Disk /dev/mmcblk0: 30.6GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags: 

Number  Start   End     Size    Type     File system  Flags
 1      1049kB  16.0GB  16.0GB  primary  ext2
 2      16.0GB  30.6GB  14.6GB  primary  ext2

It just doesn't care about /dev/mmcblk0boot0. Nor cfdisk does. As to fdisk this is its output:

Code:

root@darkstar~# fdisk -l
Disk /dev/mmcblk0: 28.5 GiB, 30601641984 bytes, 59768832 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x48727b69

Device         Boot    Start      End  Sectors  Size Id Type
/dev/mmcblk0p1          2048 31250000 31247953 14.9G 83 Linux
/dev/mmcblk0p2      31250432 59768831 28518400 13.6G 83 Linux


Disk /dev/mmcblk0boot1: 4 MiB, 4194304 bytes, 8192 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/mmcblk0boot0: 4 MiB, 4194304 bytes, 8192 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
root@darkstar~#

Again no errors at all. A way to explain this? When parted says 'disk label' I know I must understand disk partition and not the ID placed by e2label.

michaelk · 12-08-2018, 12:10 PM

How did you create the disk label? Post your exact steps.

business_kid · 12-08-2018, 12:11 PM

Code:

bash-4.4$ lsblk
NAME        MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
sda           8:0    0 223.6G  0 disk 
├─sda1        8:1    0     1G  0 part /boot
├─sda2        8:2    0     6G  0 part [SWAP]
├─sda3        8:3    0    25G  0 part /
├─sda4        8:4    0     1K  0 part 
├─sda5        8:5    0    30G  0 part /home
├─sda6        8:6    0    25G  0 part /media/hd0
└─sda7        8:7    0 136.6G  0 part /mnt/virtual
sr0          11:0    1  1024M  0 rom  
mmcblk0     179:0    0  31.3G  0 disk 
└─mmcblk0p1 179:1    0  31.3G  0 part

It's usually mmcblk0p1, p2, etc. You're on your own with /dev/mmcblk0boot0, and I have yet to meet a system that boots them. You have to initialise usb, then load their driver and the average bios isn't up for that at all.

stf92 · 12-08-2018, 01:06 PM

Thanks business_kid.

@michaelk: for certain it was not fdisk. It was a long time ago and don't remember if it was parted or cfdisk. But very recently I used parted to erase mmcblk0p2, expand mmcblk0p1 to take the whole disk and then shrink mmcblk0p1 and create mmcblk0p2 restoring in this way the old status, the one shown here in this thread.

michaelk · 12-08-2018, 01:45 PM

I was thinking it was something else... From what I can tell mmcblk0boot0 and mmcblk0oot1 are hardware-defined partitions in the eMMC distinct from the mmcblk0pN partitions that are defined by the MBR partition table.

stf92 · 12-08-2018, 02:57 PM

All right. So I won't take notice of the parted -l error message. But why parted -l outputs an error and the error vanishes when inside parted (print command)?