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sTec Senior Firmware Engineer Interview Question

I interviewed in Santa Ana, CA and was asked:
"If a SATA drive is pulled off from an mid-level SAS expander to which the device is connected using SATA bridge and if the SATA drive is inserted back into the expander, how does the Host software know whether this drive is same as the drive which was accessed before"
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Answer

Part of a Senior Firmware Engineer Interview Review - one of 11 sTec Interview Reviews

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Read VPD from the device using INQUIRY command which gets propagated to the expander and the expander translates the SAS INQUIRY to SATA based protocol and gets the information of the device.

- Interview Candidate on Nov 8, 2010

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