KatolaZ <kato...@freaknet.org> writes:

> On Mon, Feb 19, 2018 at 02:28:35PM -0300, Renaud (Ron) OLGIATI wrote:
>
> [cut]
>
>> 
>> More info: Plugged in another box (running a fresh install of PCLinuxOS, 
>> another systemd-free distro) I get df and fdisk to give me the proper size 
>> value.
>> 
>> While there I reformatted the drive to fat32; plugged it back in the Devuan 
>> box, fdisk still gives the wrong size, and still tells me it is ext4...
>>  
>
> Just throwing a random comment: are you sure the device does not
> contain a gpt? If that is the case, the correct partition table would
> be seen only via gdisk, not via fdisk.
>
> My2RandomCents
>
> KatolaZ

Indeed!
But GPT should be supported, right?
What's wrong in my case?

For me, gdisk reports:

Partition table scan:
  MBR: MBR only
  BSD: not present
  APM: not present
  GPT: present

Found valid MBR and GPT. Which do you want to use?
 1 - MBR
 2 - GPT
 3 - Create blank GPT

Your answer: 2
Using GPT and creating fresh protective MBR.
Warning! Main partition table overlaps the first partition by 64 blocks!
You will need to delete this partition or resize it in another utility.

Command (? for help): p
Disk /dev/sdb: 122915328 sectors, 58.6 GiB
Logical sector size: 512 bytes
Disk identifier (GUID): 0E61D47A-C4A0-4997-9643-9ED44851CA06
Partition table holds up to 248 entries
First usable sector is 64, last usable sector is 3953248
Partitions will be aligned on 32-sector boundaries
Total free space is 1 sectors (512 bytes)

Number  Start (sector)    End (sector)  Size       Code  Name
   2            1568            2207   320.0 KiB   0700  ISOHybrid1

Partition GUID code: EBD0A0A2-B9E5-4433-87C0-68B6B72699C7 (Microsoft basic data)
Partition unique GUID: 0E61D47A-C4A0-4997-9641-9ED44851CA06
First sector: 1568 (at 784.0 KiB)
Last sector: 2207 (at 1.1 MiB)
Partition size: 640 sectors (320.0 KiB)
Attribute flags: 1000000000000001
Partition name: 'ISOHybrid1'

###
Your answer: 1

Command (? for help): p
Disk /dev/sdb: 122915328 sectors, 58.6 GiB
Logical sector size: 512 bytes
Disk identifier (GUID): 58C208DD-6766-4380-A326-A01C2C46A44A
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 122915294
Partitions will be aligned on 2048-sector boundaries
Total free space is 2493 sectors (1.2 MiB)

Number  Start (sector)    End (sector)  Size       Code  Name
   1            2048       122914815   58.6 GiB    0700  Microsoft basic data


References:
1. 
https://www.howtogeek.com/193669/whats-the-difference-between-gpt-and-mbr-when-partitioning-a-drive/
2. https://en.wikipedia.org/wiki/GUID_Partition_Table
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