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我有一个写保护的 USB：

dmesg | tail

[10098.126089] sd 7:0:0:0: [sdb] Write Protect is on
[10098.126098] sd 7:0:0:0: [sdb] Mode Sense: 23 00 80 00
[10098.126779] sd 7:0:0:0: [sdb] No Caching mode page present
[10098.126788] sd 7:0:0:0: [sdb] Assuming drive cache: write through
[10098.131418] sd 7:0:0:0: [sdb] No Caching mode page present
[10098.131425] sd 7:0:0:0: [sdb] Assuming drive cache: write through
[10098.133335]  sdb: sdb1
[10098.135509] sd 7:0:0:0: [sdb] No Caching mode page present
[10098.135515] sd 7:0:0:0: [sdb] Assuming drive cache: write through …