Why are spaces removed from the disk serial number?

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I am investigating a bug report from a user where dmraid fails to recognize their array because one of the disks serial numbers does not appear to match the serial number recorded in the disk table slot for their isw raid ( which works fine in windows ). It looks like dmraid reads the serial number from the disk with an inquiry command, then removes whitespace characters from it. Why is this and could this be the cause of the problem? Also, it appears that the disk serial number contains non ascii characters. Is this normally allowed and how should they be interpreted? UTF-8?

The full bug report can be found here:

https://bugs.launchpad.net/ubuntu/+source/dmraid/+bug/138130

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