dd on Catalina gives "Permission denied" error even after grant it Full Disk Access in Security and Privacy date; sudo dd bs=1M if=2020-02-13-raspbian-buster-full.img of=/dev/rdisk3; date
    Thu Apr 23 20:22:45 PDT 2020
    Password:
    dd: failed to open '/dev/rdisk3': Permission denied
    Thu Apr 23 20:22:54 PDT 2020


I've tried giving Full Disk Access to all of these, but to no avail:

/usr/local/bin/gdd
/usr/local/bin/dd
/usr/local/opt/coreutils/libexec/gnubin/gdd
/usr/local/opt/coreutils/libexec/gnubin/dd




The device exists:

diskutil list
/dev/disk0 (internal, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *1.0 TB     disk0
   1:                        EFI EFI                     209.7 MB   disk0s1
   2:                 Apple_APFS Container disk1         1.0 TB     disk0s2

/dev/disk1 (synthesized):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      APFS Container Scheme -                      +1.0 TB     disk1
                                 Physical Store disk0s2
   1:                APFS Volume d - Data                638.3 GB   disk1s1
   2:                APFS Volume Preboot                 81.1 MB    disk1s2
   3:                APFS Volume Recovery                526.9 MB   disk1s3
   4:                APFS Volume VM                      3.2 GB     disk1s4
   5:                APFS Volume d                       11.1 GB    disk1s5

/dev/disk2 (external, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *8.0 TB     disk2
   1:                        EFI EFI                     209.7 MB   disk2s1
   2:                  Apple_HFS time-machine2           2.0 TB     disk2s2
   3:                  Apple_HFS data2                   6.0 TB     disk2s3

/dev/disk3 (internal, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:     FDisk_partition_scheme                        *31.9 GB    disk3
   1:             Windows_FAT_32 NO NAME                 31.9 GB    disk3s1


I'm not sure what the problem is?
My bad.
If this happens to you, you might want to check the switch on your SD card to see if it is set to read-only. :)