Thanks.   Now it makes sense.

On 12/1/22 15:05, Joseph Sinclair via PLUG-discuss wrote:
> Specifications set minimum requirements, rarely does a specification set an actual maximum limit.
> In this case, the specification requires that compliant hardware support *at least* the rates specified (within the defined optionality of the specification), but does not bar hardware from supporting higher rates or additional features, as long as the specification is met otherwise.
> Most likely the manufacturer is quoting the maximum possible rate for their hardware under laboratory conditions and using carefully specified supporting hardware; rather than the real world conditions with various unknown additional hardware elements (e.g. a card reader) and environmental conditions.
> Basically, you'll probably never see the maximum quoted data rate because some *other* hardware in the system probably won't support it (again, readers *can* support higher speeds, but most won't), but the card *could* deliver data at those rates in a theoretical perfect environment.
> Most quoted rates do, somewhere in fine print and often only on their website, describe the basis for the claim.  With a little digging you can probably find the exact answer if you're curious enough.
>
>
> On 2022-12-01 02:22 PM, Jim via PLUG-discuss wrote:
>> I know this isn't really a linux question, but I don't know who else to ask and I haven't yet found an answer online, but I'm still looking.
>>
>> I'm looking at buying a micro sd card and have found some UHS -I cards that advertize 180 MB/s read speeds and 130 MB/s write speeds,  I've also read that UHS - I is supposed to have a maximum speed of 104 MB/s.  Are the card makers guilty of false advertizing, or is there some way to get around the 104 MB/s limit?
>>
>>
>> thanks
>>
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