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I have a suspect microSD card that is puzzling me.

It is formatted for a RaspberryPi with small fat32 partitions and a 7.5GB Ext4 partition.

I cannot seem to format this drive - that is not an issue except gparted says 'all operations successfully completed' with green ticks by the various steps it takes when I try to delete both partitions.

dd gives the following;

sudo dd if=/dev/zero of=/dev/mmcblk0 bs=1M status=progress
7831814144 bytes (7.8 GB, 7.3 GiB) copied, 93 s, 84.2 MB/s
dd: error writing '/dev/mmcblk0': No space left on device

7528+0 records in
7527+0 records out
7892631552 bytes (7.9 GB, 7.4 GiB) copied, 118.328 s, 66.7 MB/s
Yet when mounted the disk still has its original RaspberryPi partitions.

There is no data I need to recover, quite happy to dispose of disk but why would gparted and dd both suggest the wiping operations were successful when they obviously are not?

09-29-2020, 08:48 AM
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