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Re: Advise me (& everyone) about the use of inexpensive $16 64GB flash cards on Android 7.0 Nougat phones

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Arlen Holder <arlenholder@nospam.net> writes:

> What is ambiguous to me is the "up to" claim of "up to 100 MB/s". 
> That could mean 1MB/sec or 10MB/sec or 40MB/s, etc.
> So it doesn't really tell me much *unless* there's some industry standard
> that accompanied that claim that gives us more accurate information.

The SD card organization has a reasonable presentation about the speeds
at https://www.sdcard.org/developers/overview/speed_class/index.html and
https://www.sdcard.org/developers/overview/application/index.html

The up to 100 MB/s probably comes from UHS-1 which defines a bus
interface that can go that fast. It says nothing about what the card can
actually do. OTOH, UHS-1 does specify a minimum write speed of 10 MB/s.

The speed classes and video speed classes also specify a minimum write
speed. So for example, Class 10 has 10 MB/s or more. The card I
currently have in the phone is like that (Sandisk Ultra 128 GB, class
10, UHS-1, A1).

The last above, A1, is "application class". It also specifies a minimum
write speed of 10 MB/s and also minimum random read and write in IOPS
which isn't that easy to translate into real world performance.

So in conclusion, nothing seems to guarantee a read speed. Minimum write
speeds are given. I think read speeds are "usually" higher than write
speeds but YMMV etc.

> I wonder what metric people use to determine the size of their SD cards?
> a. Smaller than the internal ROM?
> b. Same size?
> c. Bigger?

For me it's been larger, I have a 128 GB card in my HTC 10 now, had a 64
GB card before. This phone has 32 GB storage. But really the choice has
been price. Don't want to spend too much since it's really just
temporary storage for photos, backups and music. I rarely shoot
video. From a quick google it looks like the phone could write 30 MB/s
to a 30 MB/s card so I guess I could have faster backups with a faster
card.

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Advise me (& everyone) about the use of inexpensive $16 64GB flash cards on Android 7.0 Nougat phones Arlen Holder <arlenholder@nospam.net> - 2018-08-29 15:48 +0000
  Re: Advise me (& everyone) about the use of inexpensive $16 64GB flash cards on Android 7.0 Nougat phones I R A Darth Aggie <n0b0dy@invalid.invalid> - 2018-08-29 21:09 +0000
    Re: Advise me (& everyone) about the use of inexpensive $16 64GB flash cards on Android 7.0 Nougat phones Arlen Holder <arlenholder@nospam.net> - 2018-08-29 22:55 +0000
      Re: Advise me (& everyone) about the use of inexpensive $16 64GB flash cards on Android 7.0 Nougat phones "SC Tom" <sc@tom.net> - 2018-08-30 07:23 -0400
      Re: Advise me (& everyone) about the use of inexpensive $16 64GB flash cards on Android 7.0 Nougat phones Anssi Saari <as@sci.fi> - 2018-08-30 15:57 +0300
        Re: Advise me (& everyone) about the use of inexpensive $16 64GB flash cards on Android 7.0 Nougat phones Arlen Holder <arlenholder@nospam.net> - 2018-08-31 00:53 +0000
          Re: Advise me (& everyone) about the use of inexpensive $16 64GB flash cards on Android 7.0 Nougat phones Anssi Saari <as@sci.fi> - 2018-09-05 09:35 +0300
      Re: Advise me (& everyone) about the use of inexpensive $16 64GB flash cards on Android 7.0 Nougat phones I R A Darth Aggie <n0b0dy@invalid.invalid> - 2018-08-31 20:45 +0000
        Re: Advise me (& everyone) about the use of inexpensive $16 64GB flash cards on Android 7.0 Nougat phones The Real Bev <bashley101@gmail.com> - 2018-08-31 17:26 -0700
          Re: Advise me (& everyone) about the use of inexpensive $16 64GB flash cards on Android 7.0 Nougat phones Wade Garrett <wade@cooler.net> - 2018-09-01 09:24 -0400
            Re: Advise me (& everyone) about the use of inexpensive $16 64GB flash cards on Android 7.0 Nougat phones The Real Bev <bashley101@gmail.com> - 2018-09-01 10:29 -0700
              Re: Advise me (& everyone) about the use of inexpensive $16 64GB flash cards on Android 7.0 Nougat phones Arlen Holder <arlenholder@nospam.net> - 2018-09-01 22:29 +0000
                Re: Advise me (& everyone) about the use of inexpensive $16 64GB flash cards on Android 7.0 Nougat phones The Real Bev <bashley101@gmail.com> - 2018-09-01 21:06 -0700
              Re: Advise me (& everyone) about the use of inexpensive $16 64GB flash cards on Android 7.0 Nougat phones Wade Garrett <wade@cooler.net> - 2018-09-01 20:06 -0400
          Re: Advise me (& everyone) about the use of inexpensive $16 64GB flash cards on Android 7.0 Nougat phones Arlen Holder <arlenholder@nospam.net> - 2018-09-01 22:22 +0000
            Re: Advise me (& everyone) about the use of inexpensive $16 64GB flash cards on Android 7.0 Nougat phones The Real Bev <bashley101@gmail.com> - 2018-09-01 20:58 -0700
              Re: Advise me (& everyone) about the use of inexpensive $16 64GB flash cards on Android 7.0 Nougat phones Arlen Holder <arlenholder@nospam.net> - 2018-09-04 16:48 +0000

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