Usb thumb driver

pchome..699 跟 450

kernel message 是：

usb 3-1.3.4: new high speed USB device using ehci_hcd and address 5
usb 3-1.3.4: New USB device found, idVendor=8564, idProduct=1000
usb 3-1.3.4: New USB device strings: Mfr=1, Product=2, SerialNumber=3
usb 3-1.3.4: Product: Mass Storage Device
usb 3-1.3.4: Manufacturer: JetFlash
usb 3-1.3.4: SerialNumber: 
usb 3-1.3.4: configuration #1 chosen from 1 choice
scsi7 : SCSI emulation for USB Mass Storage devices
usb-storage: device found at 5
usb-storage: waiting for device to settle before scanning
usb-storage: device scan complete
scsi 7:0:0:0: Direct-Access     JetFlash Transcend 32GB   1100 PQ: 0 ANSI: 6
sd 7:0:0:0: Attached scsi generic sg5 type 0
61702144 512-byte logical blocks: (31.5 GB/29.4 GiB)
Write Protect is off
Mode Sense: 43 00 00 00

speed:

charles-chang@squeeze:~$ sudo hdparm -tT /dev/sde

/dev/sde:
 Timing cached reads:   14904 MB in  2.00 seconds = 7457.59 MB/sec
 Timing buffered disk reads: 102 MB in  3.03 seconds =  33.69 MB/sec
charles-chang@squeeze:~$ sudo hdparm -tT /dev/sde

/dev/sde:
 Timing cached reads:   9202 MB in  2.00 seconds = 4603.31 MB/sec
 Timing buffered disk reads: 102 MB in  3.04 seconds =  33.53 MB/sec
charles-chang@squeeze:~$ sudo hdparm -tT /dev/sde

/dev/sde:
 Timing cached reads:   14386 MB in  2.00 seconds = 7198.39 MB/sec
 Timing buffered disk reads: 102 MB in  3.04 seconds =  33.54 MB/sec

write:

charles-chang@squeeze:~/sd$ sudo dd if=/dev/zero of=tempfile bs=1M count=1024 conv=fdatasync,notrunc
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB) copied, 65.8158 s, 16.3 MB/s

第2 支

kernel msg:

usb 3-1.3.4: USB disconnect, address 5
usb 3-1.3.4: new high speed USB device using ehci_hcd and address 6
usb 3-1.3.4: New USB device found, idVendor=125f, idProduct=312b
usb 3-1.3.4: New USB device strings: Mfr=1, Product=2, SerialNumber=3
usb 3-1.3.4: Product: ADATA USB Flash Drive
usb 3-1.3.4: Manufacturer: ADATA
usb 3-1.3.4: SerialNumber: 000000000000
usb 3-1.3.4: configuration #1 chosen from 1 choice
scsi8 : SCSI emulation for USB Mass Storage devices
usb-storage: device found at 6
usb-storage: waiting for device to settle before scanning
usb-storage: device scan complete
scsi 8:0:0:0: Direct-Access     ADATA    USB Flash Drive  1.00 PQ: 0 ANSI: 6
sd 8:0:0:0: Attached scsi generic sg5 type 0
61739008 512-byte logical blocks: (31.6 GB/29.4 GiB)
Write Protect is off
Mode Sense: 23 00 00 00

speed:

charles-chang@squeeze:~$ sudo hdparm -tT /dev/sde

/dev/sde:
 Timing cached reads:   9560 MB in  2.00 seconds = 4782.52 MB/sec
 Timing buffered disk reads: 104 MB in  3.02 seconds =  34.49 MB/sec

write: