Olá irtigor
Me assustei com a sua colocação e resolvi voltar atrás no procedimento. Para minha surpresa quando retornei nas permissões do arquivo "sda1" a minha alteração anterior não estava salva, ou seja, a permissão permaneceu para o grupo "disk". Sendo assim, de fato, não faço a mínima ideia do que fez o drive voltar a ler as mídias.
Aqui está a resposta do comando que você solicitou:
brw-rw---- 1 root floppy 2, 0 2010-06-12 16:55 fd0
brw-rw---- 1 root floppy 2, 84 2010-06-12 16:55 fd0u1040
brw-rw---- 1 root floppy 2, 88 2010-06-12 16:55 fd0u1120
brw-rw---- 1 root floppy 2, 28 2010-06-12 16:55 fd0u1440
brw-rw---- 1 root floppy 2, 124 2010-06-12 16:55 fd0u1600
brw-rw---- 1 root floppy 2, 44 2010-06-12 16:55 fd0u1680
brw-rw---- 1 root floppy 2, 60 2010-06-12 16:55 fd0u1722
brw-rw---- 1 root floppy 2, 76 2010-06-12 16:55 fd0u1743
brw-rw---- 1 root floppy 2, 96 2010-06-12 16:55 fd0u1760
brw-rw---- 1 root floppy 2, 116 2010-06-12 16:55 fd0u1840
brw-rw---- 1 root floppy 2, 100 2010-06-12 16:55 fd0u1920
brw-rw---- 1 root floppy 2, 12 2010-06-12 16:55 fd0u360
brw-rw---- 1 root floppy 2, 16 2010-06-12 16:55 fd0u720
brw-rw---- 1 root floppy 2, 120 2010-06-12 16:55 fd0u800
brw-rw---- 1 root floppy 2, 52 2010-06-12 16:55 fd0u820
brw-rw---- 1 root floppy 2, 68 2010-06-12 16:55 fd0u830
brw-rw---- 1 root disk 7, 0 2010-06-12 16:55 loop0
brw-rw---- 1 root disk 7, 1 2010-06-12 16:55 loop1
brw-rw---- 1 root disk 7, 2 2010-06-12 16:55 loop2
brw-rw---- 1 root disk 7, 3 2010-06-12 16:55 loop3
brw-rw---- 1 root disk 7, 4 2010-06-12 16:55 loop4
brw-rw---- 1 root disk 7, 5 2010-06-12 16:55 loop5
brw-rw---- 1 root disk 7, 6 2010-06-12 16:55 loop6
brw-rw---- 1 root disk 7, 7 2010-06-12 16:55 loop7
brw-rw---- 1 root disk 1, 0 2010-06-12 16:55 ram0
brw-rw---- 1 root disk 1, 1 2010-06-12 16:55 ram1
brw-rw---- 1 root disk 1, 10 2010-06-12 16:55 ram10
brw-rw---- 1 root disk 1, 11 2010-06-12 16:55 ram11
brw-rw---- 1 root disk 1, 12 2010-06-12 16:55 ram12
brw-rw---- 1 root disk 1, 13 2010-06-12 16:55 ram13
brw-rw---- 1 root disk 1, 14 2010-06-12 16:55 ram14
brw-rw---- 1 root disk 1, 15 2010-06-12 16:55 ram15
brw-rw---- 1 root disk 1, 2 2010-06-12 16:55 ram2
brw-rw---- 1 root disk 1, 3 2010-06-12 16:55 ram3
brw-rw---- 1 root disk 1, 4 2010-06-12 16:55 ram4
brw-rw---- 1 root disk 1, 5 2010-06-12 16:55 ram5
brw-rw---- 1 root disk 1, 6 2010-06-12 16:55 ram6
brw-rw---- 1 root disk 1, 7 2010-06-12 16:55 ram7
brw-rw---- 1 root disk 1, 8 2010-06-12 16:55 ram8
brw-rw---- 1 root disk 1, 9 2010-06-12 16:55 ram9
brw-rw---- 1 root disk 8, 0 2010-06-12 16:55 sda
brw-rw---- 1 root disk 8, 1 2010-06-12 16:55 sda1
brw-rw---- 1 root disk 8, 2 2010-06-12 16:55 sda2
brw-rw---- 1 root disk 8, 5 2010-06-12 16:55 sda5
brw-rw----+ 1 root cdrom 11, 0 2010-06-12 16:57 sr0
Pode me explicar do que se trata este comando e o que a minha resposta indica?