this post was submitted on 05 Dec 2023
966 points (98.7% liked)

linuxmemes

21222 readers
59 users here now

Hint: :q!

Sister communities:

Community rules (click to expand)

1. Follow the site-wide rules

2. Be civil
  • Understand the difference between a joke and an insult.
  • Do not harrass or attack members of the community for any reason.
  • Leave remarks of "peasantry" to the PCMR community. If you dislike an OS/service/application, attack the thing you dislike, not the individuals who use it. Some people may not have a choice.
  • Bigotry will not be tolerated.
  • These rules are somewhat loosened when the subject is a public figure. Still, do not attack their person or incite harrassment.
    • 3. Post Linux-related content
  • Including Unix and BSD.
  • Non-Linux content is acceptable as long as it makes a reference to Linux. For example, the poorly made mockery of sudo in Windows.
  • No porn. Even if you watch it on a Linux machine.
    • 4. No recent reposts
  • Everybody uses Arch btw, can't quit Vim, and wants to interject for a moment. You can stop now.

    • Please report posts and comments that break these rules!

    founded 1 year ago
    MODERATORS
    [email protected]
    [email protected]
    [email protected]
    966
    usb formatting (sh.itjust.works)
    submitted 11 months ago by [email protected] to c/[email protected]
    53 comments fedilink hide all child comments
     

    shamelessly stolen from nixCraft on mastodon

    you are viewing a single comment's thread
    view the rest of the comments
    [โ€“] [email protected] 1 points 11 months ago* (last edited 11 months ago) (1 children)

    so why even use pv since all you're doing is measuring your RAM speed and available cache size

    This is probably why pv progress fills in a second but is only done after a few minutes. Nonetheless, shell redirect, cat, cp work fine and handle blocksize and cache dynamically.

    Your worst case scenario never happened to me after years of using pv/cp for flashing sticks/overwriting/copying partitions, even with some ...risky mount settings. Honestly doesn't make much sense to me either. Again, dd isn't some sort of magical safe handle to make the process progress smoothly. Like i use to say, dd is a skalpell, not a shovel.

    [โ€“] [email protected] 2 points 11 months ago

    I mean yeah, the bits end up where they should. It's just that the speed/progress indication is near useless with pv since at the end of the copy you still need to wait for the entire write buffer to be flushed (2 GiB in my experience, which can take several minutes).

    So IMO dd with at least oflag=osync,odirect is safer than cp and pv with which a newbie might forget to run sync and unplug the usb key immediately, so they'll be missing a lot of data.

    Maybe some people use dd for the wrong reason, it's their problem, but the solution is to use dd bs=4M oflag=osync,odirect, not to use cp.