USB stack

[blubee blubeeme]

On Sun, Jan 7, 2018 at 12:17 PM, Warner Losh <imp at bsdimp.com> wrote:

>
>
> On Sat, Jan 6, 2018 at 9:08 PM, blubee blubeeme <gurenchan at gmail.com>
> wrote:
>
>> On Sun, Jan 7, 2018 at 11:56 AM, blubee blubeeme <gurenchan at gmail.com>
>> wrote:
>>
>> > I ask does FreeBSD usb stack actually implements USB spec 2.0 or greater
>> > and the topic gets derailed...?
>> >
>> > Are you guys saying that 7-8MB/s is USB speeds?
>> >
>> > On Thu, Jan 4, 2018 at 6:44 PM, O'Connor, Daniel <darius at dons.net.au>
>> > wrote:
>> >
>> >>
>> >>
>> >> > On 4 Jan 2018, at 09:23, Gary Jennejohn <gljennjohn at gmail.com>
>> wrote:
>> >> >> What is an "LG v30"?
>> >> >>
>> >> > It's a smartphone from LG and only supports USB2 speed.  The reported
>> >> > transfer rate is no big surprise.
>> >>
>> >> OK thanks.
>> >>
>> >> --
>> >> Daniel O'Connor
>> >> "The nice thing about standards is that there
>> >> are so many of them to choose from."
>> >>  -- Andrew Tanenbaum
>> >> GPG Fingerprint - 5596 B766 97C0 0E94 4347 295E E593 DC20 7B3F CE8C
>> >>
>> >>
>> > Actually, this post: https://forums.freebsd.org/threads/41041/
>>
>> on the forum from 2013 pretty well describes what I am experiencing when
>> moving data over USB.
>>
>> I have no problems hitting very high read/ write speeds using dd or
>> downloading something but copying by USB is excruciatingly slow.
>>
>> Why is that?
>
>
> If you are copying a boatload of tiny files to USB there's two issues.
> Both our UFS and MSDOS don't do well in this case. Second, for flash based
> USB thumbdrives, most of them have horrible write performance unless you
> buy quality drives...
>
> Warner
>
I would consider this：
https://www.samsung.com/us/computing/memory-storage/memory-cards/micro-sd-evo-256gb-memory-card-w-adapter-mb-mc256da-am/
 256GB Samsung microsd card quality.