Unable to copy disk image to some of my SDs. - Raspberry Pi Forums

hello all. desperately working away here ran nasty hitch...

can backup , restore disk images , 1 brand of disk (element 14) - if use brand (sandisk - fresh newegg , real), error when copying it.

have full log @ end of posting, , seems pretty clear me doesn't copy last 8mb or onto sandisk. guess because sandisk tiny bit smaller element 14...

there's tons of empty space of course doesn't make difference in copying disk images.

i've looked @ instructions resizing partitions - don't seem work distribution (a recent raspian debian distrib).

one, want use statements

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fdisk -cu /dev/mmcblk0

- -cu isn't valid flag according man fdisk (and trying run anyway gets predictable error).

if follow man page , try

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fdisk /dev/mmcblk0

program start - shows me *zero* partitions, can't delete , recreate partition.

since rearranging partitions destructive, decided stop there...

have mac , couple of rps here. tomorrow i'll have pc laptop though i'd rather solution didn't go through pc (i don't have 1 around).

in advance kind attention!

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$ # copy onto element 14 disk.  $ dd bs=1m if=/users/tom/echomesh.img of=/dev/rdisk1 3790+0 records in 3790+0 records out 3974103040 bytes transferred in 635.768781 secs (6250862 bytes/sec)  $ # works fine  $ # copy onto sandisk  $ dd bs=1m if=/users/tom/echomesh.img of=/dev/rdisk1 dd: /dev/rdisk1: short write on character device dd: /dev/rdisk1: input/output error 3782+0 records in 3781+1 records out 3965190144 bytes transferred in 802.021344 secs (4943996 bytes/sec)  $ # doesn't boot. 

not 4gb sd cards same size ...

can see, element 14 disk 3790 x 1mb

apparently, sandisk 3781 x 1mb

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