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为什么我的 USB 硬盘返回 SG_IO: bad/missing sense data?

我能够从外部 USB 硬盘启动和运行命令;有问题的消息出现约 45 秒,然后启动继续。GRUB2 安装在内部硬盘上。When choosing to boot directly to /dev/sdb the message doesn't appear, however boot time is about the same as booting to internal HDD.

/dev/sdb:
 Timing cached reads:   1018 MB in  2.00 seconds = 508.97 MB/sec
 Timing buffered disk reads:  80 MB in  3.03 seconds =  26.37 MB/sec
pfeiffep@de:~$ sudo hdparm -i /dev/sdb


/dev/sdb:
SG_IO: bad/missing sense data, sb[]:  70 00 05 00 00 00 00 10 00 00 00 00 20 00 00 00 00 …
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ubuntu grub2 external-hard-drive

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