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Hdparm- Detailed information from USB-Device

I tried to use hdparm to read the serial number form a USB-Drive. Unfortunately the command “hdparm –I /dev/sdb” returns the following error message (I’ve tried several USB-Devices and all are returning the same error message):
C:\Program Files (x86)\hdparm>hdparm.exe -I /dev/sdb
      1 [main] hdparm 4168 find_fast_cwd: WARNING: Couldn't compute FAST_CWD pointer.  Please report this problem to
the public mailing list cygwin@xxxxxxxxxx
HDIO_DRIVE_CMD(identify) failed: Function not implemented
The version I am using has the tag: V6.9-20070228
Btw: Getting detailed information from my local hard drive (/dev/sda) works as expected.
Many thanks for a short reply!
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