Author: Fred Date: To: dng Subject: Re: [DNG] fdisk SD card partitioning question
On 6/12/22 14:09, Fred wrote: > On 6/12/22 13:48, ael wrote:
>> On Sun, Jun 12, 2022 at 12:35:06PM -0700, Fred wrote:
>>> On 6/12/22 09:18, Antony Stone wrote:
>>>> On Sunday 12 June 2022 at 17:11:45, Fred wrote:
>>>>
>>>>> Hello,
>>>>>
>>>>> I have some directories I want to back up to an SD card while
>>>>> preserving
>>>>> the permissions. I have tried to repartition a 64GB card and write an
>>>>> ext4 filesystem.
>>>>
>>>> What is the existing partition table?
>>>>
>>>> Out of interest, since this is ext4 and therefore Linux (not
>>>> Windows), why
>>>> partiton at all? Why not just "mkfs.ext4 /dev/sdX"?
>>>>
>>>>> fdisk says the card has 124702720 sectors and has 59.5GB available.
>>>>> However it will not make a partition over 27.5GB. Why and what to do?
>>
>> Are you sure that this is not just another example of "Flash Fraud"?
>> You could try running https://github.com/AltraMayor/f3 .
>>
>>
>>> Hi,
>>> As supplied the SD cards are intended to work with Windows. Under Linux
>>> only root can write to them and the ownership can not be changed. I
>>> want
>>> preserve permissions of data written to the card.
>>
>> I don't follow above. SD cards usually come with a vfat file system and
>> are indeed set up mainly for Windoze. But if you mount with
>> -o uid=someone,gid=someone,..
>> then that someone user can write.
>>
>> I do this all the time with a whole variety of sdhc cards. I only leave
>> them formated for vfat if I need to move them between other devices
>> (cameras, sat navs, ereaders which only read and write vfat). Otherwise
>> I use a better file system.
>>
>>>
>>> root@aragog:# /sbin/fdisk -l /dev/sdb
>>> Disk /dev/sdb: 27.48 GiB, 29504831488 bytes, 57626624 sectors
>>> Disk model: Card-Reader
>>> Units: sectors of 1 * 512 = 512 bytes
>>> Sector size (logical/physical): 512 bytes / 512 bytes
>>> I/O size (minimum/optimal): 512 bytes / 512 bytes
>>> Disklabel type: dos
>>> Disk identifier: 0x00000000
>>>
>>> Device Boot Start End Sectors Size Id Type
>>> /dev/sdb1 32768 124735487 124702720 59.5G 7 HPFS/NTFS/exFAT
>>>
>>> I don't know why the size is reported differently in two places. It
>>> is a
>>> 64GB card.
>>
>> Are you sure?? Not a faked 32GB ?
>>
>>>
>>> I tried your dd command line and things have gone downhill as the
>>> 64GB card
>>> is now only 27.4GB.
>>
>> So almost certainly a fake. Did you but this from somewhere trustworthy?
>>
>>> root@aragog:# /sbin/fdisk -l /dev/sdb
>>> Disk /dev/sdb: 27.48 GiB, 29504831488 bytes, 57626624 sectors
>>> Disk model: Card-Reader
>>> Units: sectors of 1 * 512 = 512 bytes
>>> Sector size (logical/physical): 512 bytes / 512 bytes
>>> I/O size (minimum/optimal): 512 bytes / 512 bytes
>>>
>>>
>>> I tried fdisk again with the same result.
>>>
>>> root@aragog:# /sbin/fdisk /dev/sdb
>>> Command (m for help): n
>>> Partition type
>>> p primary (0 primary, 0 extended, 4 free)
>>> e extended (container for logical partitions)
>>> Select (default p): p
>>> Partition number (1-4, default 1): 1
>>> First sector (2048-57626623, default 2048):
>>> Last sector, +/-sectors or +/-size{K,M,G,T,P} (2048-57626623, default
>>> 57626623):
>>>
>>> Created a new partition 1 of type 'Linux' and of size 27.5 GiB.
>>>
>>> Command (m for help): d
>>> Selected partition 1
>>> Partition 1 has been deleted.
>>>
>>> Command (m for help): n
>>> Partition type
>>> p primary (0 primary, 0 extended, 4 free)
>>> e extended (container for logical partitions)
>>> Select (default p): e
>>> Partition number (1-4, default 1): 1
>>> First sector (2048-57626623, default 2048):
>>> Last sector, +/-sectors or +/-size{K,M,G,T,P} (2048-57626623, default
>>> 57626623):
>>>
>>> Created a new partition 1 of type 'Extended' and of size 27.5 GiB.
>>>
>>>
>>> Any ideas?
>>
>> Yes. Almost certainly a fake....
>>
>> ael
>>
> Hi,
> I recall a lot of discussion about this on either this list or the
> Debian list. If the card was an offbrand I would assume it was fraud
> and would not have even asked here. However, the card is a SanDisk. The
> packaging becomes destroyed in removing the card so I can't take it back
> to Walfart for exchange.
>
> I would like to try the f3 program. How do I get the tarball from github?
> I found the tarball!
> You said above that you use a better filesystem for the sdhc cards. Have
> you done that for a card over 32GB? And how?
>
> Best regards,
> Fred
>
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Re: [DNG] fdisk SD card partitionin…
