Bug 216916 - [handbook] describe corrupt GPT image in USB memstick ver FreBSD 11.0
Summary: [handbook] describe corrupt GPT image in USB memstick ver FreBSD 11.0
Status: Closed Not A Bug
Alias: None
Product: Documentation
Classification: Unclassified
Component: Books & Articles (show other bugs)
Version: Latest
Hardware: Any Any
: --- Affects Many People
Assignee: freebsd-doc (Nobody)
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2017-02-08 13:51 UTC by Jozef Drahovsky
Modified: 2023-07-17 17:29 UTC (History)
1 user (show)

See Also:

Attachments
Add an attachment (proposed patch, testcase, etc.)

Note You need to log in before you can comment on or make changes to this bug.
Description Jozef Drahovsky 2017-02-08 13:51:46 UTC 
I suggest adding next text to pages handbook

https://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/bsdinstall-pre.html
2.3.1.1. Writing an Image File to USB
Procedure 2.1. Using dd to Write the Image

# dd if=FreeBSD-11.0-RELEASE-amd64-memstick.img of=/dev/da0 bs=1M conv=sync
# gpart show da0
=>      3  1433741  da0  GPT  (7.3G) [CORRUPT]
        3     1600    1  efi  (800K)
     1603      125    2  freebsd-boot  (63K)
     1728  1429968    3  freebsd-ufs  (698M)
  1431696     2048    4  freebsd-swap  (1.0M)
# gpart recover da0
# gpart show da0
=>       3  15335413  da0  GPT  (7.3G)
         3      1600    1  efi  (800K)
      1603       125    2  freebsd-boot  (63K)
      1728   1429968    3  freebsd-ufs  (698M)
   1431696      2048    4  freebsd-swap  (1.0M)
   1433744  13901672       - free -  (6.6G)

Notes: GPT partition in USB is default corrupted because every USB is differently size. GPT partition is at begin and at end. Command gpart recover da0 writes identical information from begin at the end. Some HW refuse booting with corrupt GPT.
Comment 1 Sergio Carlavilla Delgado freebsd_committer freebsd_triage 2023-07-17 17:29:24 UTC 
Thanks for the input, but fixing a USB partition table is not within the scope of the handbook.

For a case like this it would be better to look at the manual page