hello,
max size for pi 3 B plus is 32Gbite or 64Gbite ?
And the speed ? It's convenable use SD UHS II or III ?
hello,
max size for pi 3 B plus is 32Gbite or 64Gbite ?
And the speed ? It's convenable use SD UHS II or III ?
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.
Mirko <mirkk@gmail.com> wrote:sdxc_formatting.md
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/
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.
max size for pi 3 B plus is 32Gbite or 64Gbite ?
And the speed ? It's convenable use SD UHS II or III ?
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!)
On Thu, 03 Dec 2020 21:59:13 GMT, alister <alister.ware@ntlworld.com> declaimed the following:is in
not only are they not an exact measure some manufactures either do notOne: all the SD card ratings assume one of the FAT file systems
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!)
use. That means no journaling of file changes to the media.on
Two: Class-10 rating is based on streaming a SINGLE file (video)
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
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