• pi 3 max sd size

    From Mirko@3:770/3 to All on Thu Dec 3 03:29:44 2020
    hello,

    max size for pi 3 B plus is 32Gbite or 64Gbite ?
    And the speed ? It's convenable use SD UHS II or III ?

    Regards
    --

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  • From druck@3:770/3 to Mirko on Thu Dec 3 09:21:44 2020
    On 03/12/2020 02:29, Mirko wrote:
    hello,

    max size for pi 3 B plus is 32Gbite or 64Gbite ?

    64GB certainly works. I've not used a larger SD card as I move to using
    a USB3 memory stick or SSD for better reliability.

    And the speed ? It's convenable use SD UHS II or III ?

    Prior to the Pi 4B the SD card interface is quite slow, so UHS-I is more
    than sufficient.

    So I would just go with a Samsung or SanDisk 64GB UHS-I. Smaller sizes
    don't tend to be any cheaper now, and I'm not finding class 4 or 6 cards
    have any better random access speeds than a good UHS-I these days.

    ---druck

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  • From Theo@3:770/3 to Mirko on Thu Dec 3 11:58:32 2020
    Mirko <mirkk@gmail.com> wrote:
    hello,

    max size for pi 3 B plus is 32Gbite or 64Gbite ?

    I haven't tried it but I don't believe there is a size limit, at least up to the 2TB of the SD standard. You'll have to reformat >32GiB cards to not be ExFAT - writing an image with dd or Etcher (rather than installing via
    NOOBS) will do that.

    And the speed ? It's convenable use SD UHS II or III ?

    Look for IOPS or 4K random write benchmarks for a card. That's generally
    the performance bottleneck for running an OS on it, rather than raw MB/s.

    Theo

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  • From Martin Gregorie@3:770/3 to Theo on Thu Dec 3 13:18:42 2020
    On Thu, 03 Dec 2020 11:58:32 +0000, Theo wrote:

    Mirko <mirkk@gmail.com> wrote:
    hello,

    max size for pi 3 B plus is 32Gbite or 64Gbite ?

    I haven't tried it but I don't believe there is a size limit, at least
    up to the 2TB of the SD standard. You'll have to reformat >32GiB cards
    to not be ExFAT - writing an image with dd or Etcher (rather than
    installing via NOOBS) will do that.

    My old RPi2 recently refused updates using the old default 100MB FAT32 partition and a 4GB EXT4 partition (on a 4GB Sandisk SD card so I
    transferred both partitions to a new 16 GB SD card:

    - used gparted, on a laptop running Fedora Linux 32, to create a 1GB FAT32
    partition and a 15GB EXT4 partition. This step could also be done on an
    RPi using cfdisk

    - Downbloaded the latest ISO image for Clonezilla (2.7.0) from
    http://clonezilla.org/ and burnt it to a CD.

    - Used clonezilla to copy both partitions from the old SD card to the new
    one.

    - swapped SD cards in the RPi and it booted immediately from the new card.

    This should work just fine if you're running Windows on your PC because
    the Clonezilla CD is a complete, bootable Debian system. Partition the
    new SD card on the RPi if your Windows partitioning tool doesn't
    understand Linux disk formats and then populate the new card using
    Clonezilla.


    --
    --
    Martin | martin at
    Gregorie | gregorie dot org

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  • From alister@3:770/3 to Computer Nerd Kev on Thu Dec 3 21:59:13 2020
    On Thu, 03 Dec 2020 21:37:27 +0000, Computer Nerd Kev wrote:

    Mirko <mirkk@gmail.com> wrote:

    max size for pi 3 B plus is 32Gbite or 64Gbite ?
    And the speed ? It's convenable use SD UHS II or III ?

    See here:
    https://www.raspberrypi.org/documentation/installation/sd-cards.md

    "If you're planning to use a card of 64GB or more with NOOBS, see
    this page first.
    https://www.raspberrypi.org/documentation/installation/
    sdxc_formatting.md

    Note: Because of a constraint in versions of SoC's used in the
    Raspberry Pi Zero, 1 and 2, the SD card partition size limit is 256GB.
    From the Raspberry Pi 3 onwards this limitation does not apply."

    With speed, it's a case of how fast do you need it? But they note that
    the "class" ratings aren't an exact measure for general usage.

    not only are they not an exact measure some manufactures either do not
    know what they mean or simply lie
    (I have seed cards claiming class 10 but then in the specifications
    quoting transfer rates that were barely class 2!)





    --
    ... A solemn, unsmiling, sanctimonious old iceberg who looked like he
    was waiting for a vacancy in the Trinity.
    -- Mark Twain

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  • From Computer Nerd Kev@3:770/3 to Mirko on Thu Dec 3 21:37:27 2020
    Mirko <mirkk@gmail.com> wrote:

    max size for pi 3 B plus is 32Gbite or 64Gbite ?
    And the speed ? It's convenable use SD UHS II or III ?

    See here:
    https://www.raspberrypi.org/documentation/installation/sd-cards.md

    "If you're planning to use a card of 64GB or more with NOOBS, see
    this page first.
    https://www.raspberrypi.org/documentation/installation/sdxc_formatting.md

    Note: Because of a constraint in versions of SoC's used in the
    Raspberry Pi Zero, 1 and 2, the SD card partition size limit is
    256GB. From the Raspberry Pi 3 onwards this limitation does not
    apply."

    With speed, it's a case of how fast do you need it? But they note
    that the "class" ratings aren't an exact measure for general usage.

    --
    __ __
    #_ < |\| |< _#

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  • From Dennis Lee Bieber@3:770/3 to All on Fri Dec 4 13:01:36 2020
    On Thu, 03 Dec 2020 21:59:13 GMT, alister <alister.ware@ntlworld.com>
    declaimed the following:

    not only are they not an exact measure some manufactures either do not
    know what they mean or simply lie
    (I have seed cards claiming class 10 but then in the specifications
    quoting transfer rates that were barely class 2!)



    One: all the SD card ratings assume one of the FAT file systems is in use. That means no journaling of file changes to the media.

    Two: Class-10 rating is based on streaming a SINGLE file (video) on freshly formatted card -- absolutely no file fragmentation. Class-2/4/6 is based upon multiple small files (still image photos) on a possibly
    fragmented (if one has deleted some photos but not all) card.

    Three: Card makers support differing numbers of "open allocation units". The cheaper Class-10 cards may only have two open AUs -- one holds
    the FAT and the other buffers the single file data. Better cards may
    support up to 6 open AUs. Since flash memory requires a full erase (to all
    1 bits) and then can write 0-bits to the block, but can not convert a 0-bit back to a 1-bit without doing the entire block, every time the card has to
    jump to a different block it has to perform an erase and merge of "old"
    data from a different block, before writing new data into the block. Having
    6 AUs allows the card to keep some blocks open for random I/O access
    without committing them to the flash memory and running an erase cycle.
    This really helps for journaling file systems, since any write ends up with changes to at least three blocks -- write data <somewhere>, write meta-information to journal, sometime later commit journal to actual file system meta-data. On a 2 AU card, every toggle from write data (presume,
    say, a log file that gets a new line every so often) to update journal
    would trigger an erase operation on the card.


    --
    Wulfraed Dennis Lee Bieber AF6VN
    wlfraed@ix.netcom.com http://wlfraed.microdiversity.freeddns.org/

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  • From alister@3:770/3 to Dennis Lee Bieber on Sat Dec 5 11:11:17 2020
    On Fri, 04 Dec 2020 13:01:36 -0500, Dennis Lee Bieber wrote:

    On Thu, 03 Dec 2020 21:59:13 GMT, alister <alister.ware@ntlworld.com> declaimed the following:

    not only are they not an exact measure some manufactures either do not
    know what they mean or simply lie (I have seed cards claiming class 10
    but then in the specifications quoting transfer rates that were barely >>class 2!)



    One: all the SD card ratings assume one of the FAT file systems
    is in
    use. That means no journaling of file changes to the media.

    Two: Class-10 rating is based on streaming a SINGLE file (video)
    on
    freshly formatted card -- absolutely no file fragmentation. Class-2/4/6
    is based upon multiple small files (still image photos) on a possibly fragmented (if one has deleted some photos but not all) card.

    Three: Card makers support differing numbers of "open allocation units". The cheaper Class-10 cards may only have two open AUs -- one
    holds the FAT and the other buffers the single file data. Better cards
    may support up to 6 open AUs. Since flash memory requires a full erase
    (to all 1 bits) and then can write 0-bits to the block, but can not
    convert a 0-bit back to a 1-bit without doing the entire block, every
    time the card has to jump to a different block it has to perform an
    erase and merge of "old" data from a different block, before writing new
    data into the block. Having 6 AUs allows the card to keep some blocks
    open for random I/O access without committing them to the flash memory
    and running an erase cycle. This really helps for journaling file
    systems, since any write ends up with changes to at least three blocks
    -- write data <somewhere>, write meta-information to journal, sometime
    later commit journal to actual file system meta-data. On a 2 AU card,
    every toggle from write data (presume, say, a log file that gets a new
    line every so often) to update journal would trigger an erase operation
    on the card.

    yes but the card I refereed to not only tested as slow transfer rates the makers small print also quoted the same (class2) data rates.
    the class 10 branding on the card was blatantly false.

    The obscure/cheap brands are simply not to be trusted


    --
    Be it our wealth, our jobs, or even our homes; nothing is safe while the legislature is in session.

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  • From Scott Alfter@3:770/3 to alister.ware@ntlworld.com on Mon Dec 7 17:45:37 2020
    In article <pVJyH.87366$gXy7.81375@fx40.ams4>,
    alister <alister.ware@ntlworld.com> wrote:
    yes but the card I refereed to not only tested as slow transfer rates the >makers small print also quoted the same (class2) data rates.
    the class 10 branding on the card was blatantly false.

    The obscure/cheap brands are simply not to be trusted

    The bigger concern with cheap cards is often whether they even deliver the advertised capacity. Consider this:

    https://www.amazon.com/-/dp/B08L95DWDY/

    $16 for 1 TB? You can't even get spinning rust that cheap. If it sounds
    too good to be true, that's because it is.

    https://www.amazon.com/-/dp/B08HCPTMJG/

    $230 for 1 TB is closer to what you'd expect, with 512-GB options ranging
    from $65 to $100. (It's also SanDisk, instead of a company you've never
    heard of.)

    _/_
    / v \ Scott Alfter (remove the obvious to send mail)
    (IIGS( https://alfter.us/ Top-posting!
    \_^_/ >What's the most annoying thing on Usenet?

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