終於可以使用了。但用上SSD還是慢，奇怪。
先來重溫一下目前的配置：
- Raspberry Pi 4 Computer Model B 4GB RAM (brought from Element14)
- 树莓派4B 铝合金散热外壳带双风扇
- MicroHDMI to HDMI adaptor
- SD-Slot: TOSHIBA 16GB SD-Card - UC-I Class10 30MB/s
- USB3 Socket: ORICO 2.5” Enclosure (USB3 - SATA)
- Intel 2.5" SSD - SSDSA2M080G2GC (Used for 8Yrs)
利用DietPi-Benchmark測試SSD，結果如下：
結果跟USB2 的外置HD差不多，失望
查找原因
據理解，USB3外接硬碟盒如果要作為高速傳送就要有UASP (USB Attached SCSI Protocol)加持（參考1），所以要檢查目前的狀態（參考：How can I check whether USB3.0 UASP (USB Attached SCSI Protocol) mode is enabled in Linux?）。
首先查看USB詳情：
root@badbuta-pi-center:~# lsusb -t
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 5000M
|__ Port 2: Dev 2, If 0, Class=Mass Storage, Driver=usb-storage, 5000M
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/1p, 480M
|__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/4p, 480M
root@badbuta-pi-center:~# lsusb
Bus 002 Device 002: ID 357d:7788 Sharkoon QuickPort XT
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 002: ID 2109:3431 VIA Labs, Inc. Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
root@badbuta-pi-center:~# lsusb -v -s 2:2
Bus 002 Device 002: ID 357d:7788 Sharkoon QuickPort XT
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 3.00
bDeviceClass 0
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 9
idVendor 0x357d Sharkoon
idProduct 0x7788 QuickPort XT
bcdDevice 0.00
iManufacturer 10 JMicron
iProduct 11 USB to ATA/ATAPI Bridge
iSerial 3 000012345678
bNumConfigurations 1
...
ORICO硬碟盒的晶片識別為 ID 357d:7788 Sharkoon QuickPort XT，JMicron 的USB to ATA/ATAPI Bridge
看看interface:
root@badbuta-pi-center:~# lsusb -v -d 357d:7788 | grep -i interface
bNumInterfaces 1
Interface Descriptor:
bInterfaceNumber 0
bInterfaceClass 8 Mass Storage
bInterfaceSubClass 6 SCSI
bInterfaceProtocol 80 Bulk-Only
iInterface 0
Interface Descriptor:
bInterfaceNumber 0
bInterfaceClass 8 Mass Storage
bInterfaceSubClass 6 SCSI
bInterfaceProtocol 98
iInterface 0
"bInterfaceProtocol 98" 代表這個裝置是支持UASP的。
記得早前為了能使用這個盒子所以在修改了/boot/cmdline.txt，不修正的話RPI4B就辯認不到，用不了。
usb-storage.quirks=357d:7788:u console=tty1 rootdelay=10 root=PARTUUID=7235a13a-02 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait quiet net.ifnames=0"usb-storage.quirks=xxxx:yyyy:u" 就是利用quirks修正，看來是因為這個了。利用 dmesg 查看UAS：
root@badbuta-pi-center:~# dmesg | grep "usb" ... [ 2.057052] usb 2-2: New USB device found, idVendor=357d, idProduct=7788, bcdDevice= 0.00 [ 2.057058] usb 2-2: New USB device strings: Mfr=10, Product=11, SerialNumber=3 [ 2.057063] usb 2-2: Product: USB to ATA/ATAPI Bridge [ 2.057068] usb 2-2: Manufacturer: JMicron [ 2.057072] usb 2-2: SerialNumber: 000012345678 [ 2.059043] usb 2-2: UAS is blacklisted for this device, using usb-storage instead [ 2.059082] usb 2-2: UAS is blacklisted for this device, using usb-storage instead [ 2.059087] usb-storage 2-2:1.0: USB Mass Storage device detected [ 2.059272] usb-storage 2-2:1.0: Quirks match for vid 357d pid 7788: 800000 [ 2.059324] scsi host0: usb-storage 2-2:1.0
"usb 2-2: UAS is blacklisted for this device, using usb-storage instead" 就是說不用UAS，只用半雙工的usb-storage。
暫時找不到方法，要不用回 Unitek 的盒子，但怕又會弄死一隻SSD，要不另買一個。但當看到Orico 所用晶片的序號時，我想暫時不會再考慮了。