All drives, including C7, show error code 0000 for a 'no errors' status. This means the drive is good and is not to be replaced.

Note: This version of GWSCAN now repairs ECC errors on non-WD drives.

The 3 error code digits to the right of the C7 bit are:

Code	Error	Description
200	-	Drive is an AC31600-not yet tested
201	-	Non-WD drive
202	-	WD drive but not an AC31600-not yet tested
203	-	DRM attribute too low before media scan
204	-	DRM attribute too low after media scan
205	-	Power on hours too low for AC31600 and within date range
206	-	Power on hours too low for AC31600 and exceed re-test limit
207	-	SMART STATUS failed before the media scan
208	-	SMART STATUS failed after the media scan
210	-	Self test failed
211	-	Self test never completed
212	-	Error while relocating TARE sect
256	ECC	Error Correction Code, a media defection on the hard drive's surface
257	ECC2-9	2 to 9 ECC error's
258	Ecc10+	More than 10 ECC error's
356	DAM 1	Data Address Mark, media defect or a mechanical defect (servo error)
357	DAM 2-9	2 to 9 DAM error's
358	DAM10+	More than 10 DAM error's
456	IDNF 1	ID Not Found; indicates problems with the servo heads
457	IDNF 2-9	2 to 9 IDNF error's
458	ISNF 10+	More than 10 IDNF error's
550	Abort CMD (Controller)	A Write/Read command was not completed
556	SERVO 1	Mechanical failure of servo. Mostly caused by mishandling
557	SERVO 2-9	2 to 9 SERVO's error's
558	SERVO 10+	More than 10 SERVO error's
570	No Re-calibration	Re-calibration cycle not completed while spinning up
580	Missing Interrupt	Communication between host and hard drive is malfunctioning
581	Write Fault	Error occurred whilst writing data to hard drive
582	Drive Not Ready	Hard drive does not give ready signal to host
583	Busy Command Error	Hard drive is busy but is in a loop
584	Diag Command Error	Can not diagnostics mostly due to problems with the heads
585	Busy Time-out	Hard drive takes to long to complete command (app. 30 sec)
586	DRO Time-out	Drive request; signal from master or slave hard drive takes to long
587	Bad Sector	Media defect
588	DRQ Not Expected	Drive request; received unexpected signal from master or slave
599	Other Failure

Error code examples

0256	A non-C7 with 1 ECC error.
1256	A c7 with 1 ECC error.
0000	Any drive that has passed the test

A drive with the following error codes possibly can be repaired by relocating sectors and or tracks; the Repair option needs to be run. All other error codes are not repairable. The following error codes only show 3 digits since the leftmost digit can be either 0 (non-C7) or 1 (C7).

Repairable with Track Relocations

456	IDNF 1
457	IDNF 2-9
556	SERVO 1
557	SERVO 2-9

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REPAIRING A DRIVE

• AC140, AC160, AC280, AC2120, AC2170, AC2200

A drive is possibly repairable if the only errors found are:

• ECC errors
• DAM errors
• IDNF errors
• Bad sector errors

The Repair option issues Relocate Sector commands and Relocate Track commands and then rescans the drive to verify that the drive is defect-free. If errors are found during the rescan, then the drive is labeled Unrepairable.

During the Test Drive option, the scan is terminated when 10 errors are detected. The Repair option can be selected then to repair these errors. At the end of the Repair option, the drive is rescanned, and if any additional errors are found, the drive is labelled Unrepairable, and a message requesting the user to contact GW Tech Support is displayed.

When a sector is relocated, the data from the sector is transferred to the new sector if possible. Ten attempts are made to read the data before relocating the sector. So when relocating sectors, no user data is lost. In most cases, the data from the sector is lost already since the sector is bad.

When a track is relocated, user data is lost for all sectors on the track. No attempt is made to save data before relocating the track since it is difficult to determine which user-mode sectors correspond to a physical track. Tracks should be relocated only if all data has been backed up to another storage device. A warning is displayed whenever tracks are going to be relocated.