0

I follow the instruction on https://tutorials.ubuntu.com/tutorial/tutorial-create-a-usb-stick-on-ubuntu except I use a SD-card to flash.

When I use fdisk and parted to investigate the result of the flashed SD-card I get two very different results. Both results are very weird:

jarl@hermes:~$ sudo LANG=C fdisk -l /dev/mmcblk0
Disk /dev/mmcblk0: 1.9 GiB, 2032664576 bytes, 3970048 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: 0x133f436e

Device         Boot   Start     End Sectors  Size Id Type
/dev/mmcblk0p1 *          0 3905279 3905280  1.9G  0 Empty
/dev/mmcblk0p2      3828884 3833811    4928  2.4M ef EFI (FAT-12/16/32)
jarl@hermes:~$ sudo LANG=C parted /dev/mmcblk0
GNU Parted 3.2
Using /dev/mmcblk0
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) unit                                                             
Unit?  [compact]? b                                                       
(parted) print                                                            
Warning: The driver descriptor says the physical block size is 2048 bytes, but Linux says it is 512 bytes.
Ignore/Cancel? I                                                          
Model: SD SD02G (sd/mmc)
Disk /dev/mmcblk0: 8130658304B
Sector size (logical/physical): 2048B/512B
Partition Table: mac
Disk Flags: 

Number  Start        End          Size      File system  Name   Flags
 1      2048B        6143B        4096B                  Apple
 2      1960388608B  1962911743B  2523136B               EFI

(parted) q                                                                
  1. parted gives a warning (that I don't understand) that fdisk doesn't. Any explanation?
  2. fdisk shows that partition 2 (the EFI one) starts in the middle of partition 1 (ISO image)
  3. parted seem not to show the correct start and end of partition 1
  4. parted seem not to show the correct end of partition 2

Can anyone explain the above differences? I belive that parted is quite buggy, and that fdisk information is correct, but then again it shows overlapping partitions.

  • 1
    I do not think you are seeing standard partitions. Most of the installers now use dd or dd under the hood to create flash drive installers. And that is a hybrid DVD/flash drive image, not a standard partitioned drive with installer. If you have and only want UEFI you can create your own. UEFI only USB key, just extract ISO ( 7 zip or similar) to FAT32 formatted flash drive partition & set boot flag. askubuntu.com/questions/395879/… If you want to reuse flash drive: help.ubuntu.com/community/mkusb#Re-use_the_pendrive – oldfred Jan 5 at 16:02
  • Thank you @oldfred. Very informative answer. Thank you very much for the links – Jarl Jan 7 at 7:57

Your Answer

By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service, privacy policy and cookie policy, and that your continued use of the website is subject to these policies.

Browse other questions tagged or ask your own question.