Technical information

HGST Ultrastar C15K600 Hard Disk Drive Specification
67
17.4.5
PHY Error Handling
This section defines the PHY layer error handling of the drive.
Table 32 PHY Layer Error Handling
Error
Error Handling Procedure
Link Reset
After POR or Hard Reset, the drive initiates link reset by transmitting exactly 1
COMINIT. For other resets, the drive does not initiate Link Reset.
COMINIT Timeout
If COMINIT or COMSAS is not received before the ”Hot Plug Timeout" period
expires, the drive continues to transmit DC zero and wait for COMINIT/COMSAS.
Firmware is notified.
This is not considered an error.
COMSAS Timeout
If COMINIT is detected, COMSAS is transmitted, and COMSAS is not received
before the COMSAS Detect Timeout timer expires, firmware is notifi
ed and the
drive continues to transmit DC zero and wait for COMINIT.
Speed Negotiation Errors
If speed negotiation fails with no match, or if the drive fails retrying the matched
link rate, firmware is notified and the drive continues to transmit DC zero and wait
for COMINIT. If the match link rate retry fails, the
PHY Reset Problem counter is
incremented (Log Page 0x18).
Loss of Sync
If the drive loses Dword sync long enough for the loss of sync timer to expire,
firmware is notified and the drive transmits a COMINIT to initiate a new link reset.
The loss of Dword sync counter is incremented (Log Page 0x18).
Disparity/Invalid Dword Error
If a disparity error or an invalid Dword is detected by the drive, the Invalid Dword
Count is incremented (Log Page 0x18). The Running Disparity Error Count in Log
Page 0x18 is not used