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Re: [OCLUG-Tech] how to determine the *usable* size of an SD card?

  • Subject: Re: [OCLUG-Tech] how to determine the *usable* size of an SD card?
  • From: John C Nash <nashjc [ at ] uottawa [ dot ] ca>
  • Date: Thu, 19 Jan 2012 15:19:12 -0500
Can we have an answer to RD's question as to how to get the capacity info easily?

I use df to find filesystem size, but my guess is that there is some function/command that
will give the actual number of blocks.

JN



On 01/19/2012 03:10 PM, Singer X.J. Wang wrote:
> Exactly.. :) as it should have..
> 
> S
> 
> On Thu, Jan 19, 2012 at 15:09, Woogie <woogie [ at ] gmail [ dot ] com> wrote:
> 
>> I thought the fallout of the infamous lawsuits against the HDD
>> manufacturers was that "8Gb" and "1Tb" as labels on storage media were
>> understood to mean 8x10^9 and 1x10^12, respectively, by the courts.
>> Which is why the "proper" SI notation for file sizes as MiB and GiB is
>> showing up more often these days.
>>
>> On Thu, Jan 19, 2012 at 3:02 PM, Robert P. J. Day <rpjday [ at ] crashcourse [ dot ] ca>
>> wrote:
>>> On Thu, 19 Jan 2012, Singer X.J. Wang wrote:
>>>
>>>> That's a deviation of less then 0.5%.. that's not that bad in most
>> industries..
>>>>
>>>> S
>>>>
>>>> On Thu, Jan 19, 2012 at 14:48, Robert P. J. Day <rpjday [ at ] crashcourse [ dot ] ca>
>> wrote:
>>>>
>>>>        over the last day on the beagleboard list, there was an animated
>>>>       discussion that touched on the fact that some "dd" copies to SD
>> cards
>>>>       was failing since the actual capacity of the SD card was
>> noticeably
>>>>       less than advertised.  as in, trying to write a 4G image to an
>>>>       allegedly 4G SD card failed, "no space left on device".
>>>>
>>>>        is there a utility in linux that will tell me that *real*
>> capacity
>>>>       of an SD card if i pop it into the SD slot?  if i write an image
>> to an
>>>>       allegedly 8G micro SD card and pop it into my beagleboard, and
>> stop in
>>>>       u-boot, what i can do is:
>>>>
>>>>       # mmcinfo
>>>>       Device: OMAP SD/MMC
>>>>       Manufacturer ID: 27
>>>>       OEM: 5048
>>>>       Name: SD08G
>>>>       Tran Speed: 25000000
>>>>       Rd Block Len: 512
>>>>       SD version 2.0
>>>>       High Capacity: Yes
>>>>       Capacity: 7969177600     <--- AHA!
>>>>       Bus Width: 4-bit
>>>>       #
>>>>
>>>>        that's *clearly* less than a true 8G.  is there a way to see
>> that in
>>>>       linux?  thanks.
>>>
>>>  huh?  8G is officially 8589934592.  the value above is a full 8%
>>> smaller.
>>>
>>> rday
>>>
>>> --
>>>
>>> ========================================================================
>>> Robert P. J. Day                                 Ottawa, Ontario, CANADA
>>>                        http://crashcourse.ca
>>>
>>> Twitter:                                       http://twitter.com/rpjday
>>> LinkedIn:                               http://ca.linkedin.com/in/rpjday
>>> ========================================================================
>>>
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>>>
>>
>>
>>
>> --
>> Evil will always triumph, because good is dumb
>>
> 
> --
> Pythian proud winner of Oracle North America Titan Award for Exadata Solution...watch the video on pythian.com
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