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  • Can a standard USB have sub directives?

    From John Conover@21:1/5 to All on Thu Aug 8 20:00:02 2024
    Can a standard USB have sub directives?

    I was doing some stress testing, and some sub directives had very long
    write latency's. (All less than 4GB.)

    Thanks,

    John

    --

    John Conover, [email protected], http://www.johncon.com/

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  • From Nicolas George@21:1/5 to All on Thu Aug 8 20:30:01 2024
    John Conover (12024-08-08):
    Can a standard USB have sub directives?

    I was doing some stress testing, and some sub directives had very long
    write latency's. (All less than 4GB.)

    What is that thing you call “directive” or “sub directive”?

    Regards,

    --
    Nicolas George

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  • From Charles Curley@21:1/5 to John Conover on Thu Aug 8 21:10:01 2024
    On Thu, 8 Aug 2024 10:57:22 -0700
    [email protected] (John Conover) wrote:

    Can a standard USB have sub directives?

    A standard USB what? I shall assume you mean a block storage device,
    such as a hard drive.

    Sub directive? I shall assume you mean subdirectories.

    The answer is, that depends on the file system. Modern FAT variants,
    NTFS, Linux's file system, currently ext4, and others all allow
    subirectories. Early versions of FAT did not, but I doubt you will find
    any of those in the wild these days.

    Another question is, how deep can you nest subdirectories? Again, that
    depends on the file system. I doubt any modern file system has any
    limit (other than room available) as subdirectories are often
    stored as linked lists.


    I was doing some stress testing, and some sub directives had very long
    write latency's. (All less than 4GB.)

    I doubt the problem is subdirectories. More likely something totally
    extraneous to your tests was causing problems. I would eliminate that possibility by running such tests in single user mode.


    --
    Does anybody read signatures any more?

    https://charlescurley.com
    https://charlescurley.com/blog/

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  • From Thomas Schmitt@21:1/5 to John Conover on Thu Aug 8 22:40:02 2024
    Hi,

    John Conover wrote:
    I was doing some stress testing, and some sub directives had very long write latency's. (All less than 4GB.)

    Charles Curley wrote:
    I doubt the problem is subdirectories. More likely something totally extraneous to your tests was causing problems. I would eliminate that possibility by running such tests in single user mode.

    Didn't Gene Heskett a while ago report about adventures with fake
    USB sticks or SSDs which became slower and slower while approaching
    their tiny real size limit ?
    There was a test tool mentioned which unmasked the imposter in a few
    seconds. Torturing my memory, search engines, and my old mailboxes i
    think it was

    https://tracker.debian.org/pkg/f3

    somewhere in this thread:

    https://lists.debian.org/debian-user/2024/02/msg00313.html


    Have a nice day :)

    Thomas

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