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Error "Cannot access your USB Flash boot device"

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Hello, my server seems to have crashed with this error:

Cannot access your USB Flash boot device.

 

It's a mini PC with AMD Ryzen™ 9 6900HX processor and 2x HDD connected over USB.

 

Before I saw it crashed, I started copying files (> 1TB) onto it about 6 hours ago, could be related to this.

 

I attached the diagnostics as well. Thanks for support.

turret-diagnostics-20250203-0710.zip

Solved by JorgeB

🤥 With regard to those USB connected HDDs :

 

In Unraid, you should avoid connecting drives directly via USB because Unraid is designed to primarily use dedicated, internal SATA drives for optimal performance and data reliability; using USB drives can introduce potential issues like slower speeds, instability, and potential data loss due to accidental disconnection or power fluctuations - AI Overview

  • Community Expert
  • Solution
Feb  3 05:06:45 Turret kernel: xhci_hcd 0000:05:00.0: xHCI host not responding to stop endpoint command
Feb  3 05:06:45 Turret kernel: xhci_hcd 0000:05:00.0: xHCI host controller not responding, assume dead
Feb  3 05:06:45 Turret kernel: xhci_hcd 0000:05:00.0: HC died; cleaning up
Feb  3 05:06:45 Turret kernel: usb 2-1: USB disconnect, device number 2
Feb  3 05:06:45 Turret kernel: sd 1:0:0:0: [sdb] tag#0 UNKNOWN(0x2003) Result: hostbyte=0x03 driverbyte=DRIVER_OK cmd_age=35s
Feb  3 05:06:45 Turret kernel: sd 1:0:0:0: [sdb] tag#0 CDB: opcode=0x28 28 00 00 1c 9a a0 00 01 00 00
Feb  3 05:06:45 Turret kernel: I/O error, dev sdb, sector 1874592 op 0x0:(READ) flags 0x80700 phys_seg 16 prio class 2
Feb  3 05:06:45 Turret kernel: sd 1:0:0:0: [sdb] tag#0 UNKNOWN(0x2003) Result: hostbyte=0x01 driverbyte=DRIVER_OK cmd_age=0s
Feb  3 05:06:45 Turret kernel: sd 1:0:0:0: [sdb] tag#0 CDB: opcode=0x28 28 00 00 1c 9b a0 00 01 00 00
Feb  3 05:06:45 Turret kernel: I/O error, dev sdb, sector 1874848 op 0x0:(READ) flags 0x80700 phys_seg 8 prio class 2
Feb  3 05:06:45 Turret kernel: device offline error, dev sdb, sector 1874592 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
### [PREVIOUS LINE REPEATED 1 TIMES] ###
Feb  3 05:06:45 Turret kernel: FAT-fs (sdb1): Directory bread(block 29577) failed
Feb  3 05:06:45 Turret kernel: usb 2-2: USB disconnect, device number 3

 

Flash drive dropped offline, try a different USB port, if the same, try a different flash drive.

  • Author
On 2/3/2025 at 10:22 AM, JorgeB said:
Feb  3 05:06:45 Turret kernel: xhci_hcd 0000:05:00.0: xHCI host not responding to stop endpoint command
Feb  3 05:06:45 Turret kernel: xhci_hcd 0000:05:00.0: xHCI host controller not responding, assume dead
Feb  3 05:06:45 Turret kernel: xhci_hcd 0000:05:00.0: HC died; cleaning up
Feb  3 05:06:45 Turret kernel: usb 2-1: USB disconnect, device number 2
Feb  3 05:06:45 Turret kernel: sd 1:0:0:0: [sdb] tag#0 UNKNOWN(0x2003) Result: hostbyte=0x03 driverbyte=DRIVER_OK cmd_age=35s
Feb  3 05:06:45 Turret kernel: sd 1:0:0:0: [sdb] tag#0 CDB: opcode=0x28 28 00 00 1c 9a a0 00 01 00 00
Feb  3 05:06:45 Turret kernel: I/O error, dev sdb, sector 1874592 op 0x0:(READ) flags 0x80700 phys_seg 16 prio class 2
Feb  3 05:06:45 Turret kernel: sd 1:0:0:0: [sdb] tag#0 UNKNOWN(0x2003) Result: hostbyte=0x01 driverbyte=DRIVER_OK cmd_age=0s
Feb  3 05:06:45 Turret kernel: sd 1:0:0:0: [sdb] tag#0 CDB: opcode=0x28 28 00 00 1c 9b a0 00 01 00 00
Feb  3 05:06:45 Turret kernel: I/O error, dev sdb, sector 1874848 op 0x0:(READ) flags 0x80700 phys_seg 8 prio class 2
Feb  3 05:06:45 Turret kernel: device offline error, dev sdb, sector 1874592 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
### [PREVIOUS LINE REPEATED 1 TIMES] ###
Feb  3 05:06:45 Turret kernel: FAT-fs (sdb1): Directory bread(block 29577) failed
Feb  3 05:06:45 Turret kernel: usb 2-2: USB disconnect, device number 3

 

Flash drive dropped offline, try a different USB port, if the same, try a different flash drive.

 

it worked indeed after shutting down, changing USB port and starting again. thanks!

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