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挂 U 盘的教程比较多,你试试 dmesg ,看看有没有关于 USB 的信息
[ 9.000000] usbcore: registered new interface driver usbfs
[ 9.000000] usbcore: registered new interface driver hub
[ 9.010000] usbcore: registered new device driver usb
[ 9.640000] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[ 9.640000] ar71xx-ehci ar71xx-ehci: Atheros AR91xx built-in EHCI controller
[ 9.650000] ar71xx-ehci ar71xx-ehci: new USB bus registered, assigned bus number 1
[ 9.690000] ar71xx-ehci ar71xx-ehci: irq 3, io mem 0x1b000000
[ 9.710000] ar71xx-ehci ar71xx-ehci: USB 2.0 started, EHCI 1.00
[ 9.710000] hub 1-0:1.0: USB hub found
[ 9.710000] hub 1-0:1.0: 1 port detected
[ 9.780000] Initializing USB Mass Storage driver...
[ 9.780000] usbcore: registered new interface driver usb-storage
[ 9.790000] USB Mass Storage support registered.
[ 10.040000] usb 1-1: new high speed USB device number 2 using ar71xx-ehci
[ 10.190000] hub 1-1:1.0: USB hub found
[ 10.190000] hub 1-1:1.0: 4 ports detected
[ 10.470000] usb 1-1.1: new high speed USB device number 3 using ar71xx-ehci
[ 10.600000] scsi0 : usb-storage 1-1.1:1.0
[ 11.600000] scsi 0:0:0:0: Direct-Access HITACHI NESO 250GB 100 PQ: 0 ANSI: 2
[ 11.610000] sd 0:0:0:0: [sda] 488397168 512-byte logical blocks: (250 GB/232 GiB)
[ 11.620000] sd 0:0:0:0: [sda] Write Protect is off
[ 11.620000] sd 0:0:0:0: [sda] Mode Sense: 38 00 00 00
[ 11.620000] sd 0:0:0:0: [sda] Assuming drive cache: write through
[ 11.630000] sd 0:0:0:0: [sda] Assuming drive cache: write through
[ 12.000000] sda: sda1
[ 12.010000] sd 0:0:0:0: [sda] Assuming drive cache: write through
[ 12.010000] sd 0:0:0:0: [sda] Attached SCSI disk
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