Sandisk Usb3 Nvme Disk with Linux

Sandisk is very slow. Should be 0.5-1GByte/s but is just ~30 MBytes/s

dd ...
1073741824 Bytes (1,1 GB, 1,0 GiB) kopiert, 36,5998 s, 29,3 MB/s

lsusb
...
Bus 008 Device 013: ID 0781:55ae SanDisk Corp. Extreme 55AE

it seems the disk and kernel module uas are not compatible. Deactivating it gives better results, but not ideal since uas is the more modern implementation and would give better speed

test with this command:

echo "0781:55ae:u" | sudo tee /sys/module/usb_storage/parameters/quirks

check with this command

sudo cat /sys/module/usb_storage/parameters/quirks
0781:55ae:u

Put in kernel commandline e.g. for use with boot disk or if usb-storage is not a module

echo "0781:55ae:u" | sudo tee /sys/module/usb_storage/parameters/quirks

Look for "UAS is blacklisted" in dmesg on plug in:

[3654122.315024] usb 8-2: new SuperSpeed Gen 1 USB device number 15 using xhci_hcd
[3654122.341545] usb 8-2: New USB device found, idVendor=0781, idProduct=55ae, bcdDevice=30.01
[3654122.341547] usb 8-2: New USB device strings: Mfr=2, Product=3, SerialNumber=1
[3654122.341548] usb 8-2: Product: Extreme 55AE
[3654122.341549] usb 8-2: Manufacturer: SanDisk
[3654122.341550] usb 8-2: SerialNumber: 32323233484D443035363337
[3654122.343741] usb 8-2: UAS is blacklisted for this device, using usb-storage instead
[3654122.343744] usb-storage 8-2:1.0: USB Mass Storage device detected
[3654122.343896] usb-storage 8-2:1.0: Quirks match for vid 0781 pid 55ae: 800000
[3654122.343911] scsi host6: usb-storage 8-2:1.0
[3654124.436914] scsi 6:0:0:0: Direct-Access     SanDisk  Extreme 55AE     3001 PQ: 0 ANSI: 6
[3654124.437087] scsi 6:0:0:1: Enclosure         SanDisk  SES Device       3001 PQ: 0 ANSI: 6
[3654124.438695] sd 6:0:0:0: Attached scsi generic sg3 type 0
[3654124.438733] ses 6:0:0:1: Attached Enclosure device
[3654124.438763] ses 6:0:0:1: Attached scsi generic sg4 type 13
[3654124.438874] sd 6:0:0:0: [sdd] 3906963617 512-byte logical blocks: (2.00 TB/1.82 TiB)
[3654124.439419] sd 6:0:0:0: [sdd] Write Protect is off
[3654124.439420] sd 6:0:0:0: [sdd] Mode Sense: 17 00 10 00
[3654124.440418] ses 6:0:0:1: Failed to get diagnostic page 0x1
[3654124.440419] ses 6:0:0:1: Failed to bind enclosure -19
[3654124.440914] sd 6:0:0:0: [sdd] No Caching mode page found
[3654124.440916] sd 6:0:0:0: [sdd] Assuming drive cache: write through
[3654124.463639]  sdd: sdd1
[3654124.465461] sd 6:0:0:0: [sdd] Attached SCSI disk

now dd gives ~200MBytes/s. Not good, but better.