I’m having the exact same problem: I have an AR 750 that simply doesn’t recognize flash drives plugged into the USB port. In response to your question about logs @alzhao there’s nothing obvious in the system log (logmesg), but I did find this in the output of dmesg:
[ 6.401754] hub 1-1:1.0: 4 ports detected
[ 6.679018] usb 1-1.1: new high-speed USB device number 3 using ehci-platform
[ 6.794709] usb-storage 1-1.1:1.0: USB Mass Storage device detected
[ 6.801916] scsi host0: usb-storage 1-1.1:1.0
[ 6.879019] usb 1-1.2: new high-speed USB device number 4 using ehci-platform
[ 6.994634] usb-storage 1-1.2:1.0: USB Mass Storage device detected
[ 7.001838] scsi host1: usb-storage 1-1.2:1.0
[ 7.800754] scsi 0:0:0:0: Direct-Access Generic STORAGE DEVICE 0233 PQ: 0 ANSI: 0
[ 7.814419] sd 0:0:0:0: [sda] Attached SCSI removable disk
[ 8.000880] scsi 1:0:0:0: Direct-Access Sony Storage Media 0100 PQ: 0 ANSI: 0 CCS
[ 8.012910] sd 1:0:0:0: [sdb] 7831552 512-byte logical blocks: (4.01 GB/3.73 GiB)
[ 8.021782] sd 1:0:0:0: [sdb] Write Protect is off
[ 8.026753] sd 1:0:0:0: [sdb] Mode Sense: 43 00 00 00
[ 8.027777] sd 1:0:0:0: [sdb] No Caching mode page found
[ 8.033308] sd 1:0:0:0: [sdb] Assuming drive cache: write through
[ 8.046023] sdb:
[ 8.050906] sd 1:0:0:0: [sdb] Attached SCSI removable disk
That’s completely consistent with the device I have plugged in, it’s a SONY 4 GB thumb drive, formatted FAT32. So it looks like the kernel is finding it just fine, there’s just no hint of it on the main non-Luci front page under USB devices.
I just got this today, it has the 2.272 firmware, and the update page does not show anything available. This isn’t a deal breaker at all for me, I primarily bought this for the 5GHz wifi support. Should I just wait for the 3.xxx firmware to be released through the auto-upload channel?
I really don’t want to try and upgrade it by hand, since I’m leaving in less than a week for a trip where I must have this operational as a wifi access point. Making a mistake during the flashing and bricking the router just isn’t a risk I can afford to take.