Method for dynamically measuring computer disk error rates

• US 5,422,890 A
• Filed: 11/19/1991
• Issued: 06/06/1995
• Est. Priority Date: 11/19/1991
• Status: Expired due to Term

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Compaq Computer Corporation (HP Inc.)
• Inventors: Fairchild, Steven E., Geroche, Michael R., Klingsporn, Benny J., Lundgreen, Mark T.
• Primary Examiner(s): Beausoliel, Jr., Robert W.
• Assistant Examiner(s): HUA, LY
• Application Number:
  US07/796,051
• Time in Patent Office: 1,295 Days
• Field of Search: 371/21.6, 371/21.1, 371/21.2, 371/5.1, 371/5.2, 371/5.3, 371/5.5, 360/54, 324/128 R
• US Class Current: 714/723
• CPC Class Codes: G06F 11/008 Reliability or availability analysis
• CPC Class Codes: G06F 11/076 by exceeding a count or rate limit, e.g. word- or bit count limit
• CPC Class Codes: G06F 11/2205 using arrangements specific to the hardware being tested
• CPC Class Codes: G06F 11/2221 to test input/output devices or peripheral units
• CPC Class Codes: G06F 11/3485 for I/O devices
• CPC Class Codes: G11B 20/182 using test patterns

Abstract

A dynamic testing method for determining disk drive error rates based on the number of bytes which are read from a hard disk drive during test. The method identifies specific faulting disk sectors and disk error types and maintains a log of the errors. The method also accumulates the total number of bytes which have been read from the disk and determines whether the disk under test has exceeded acceptable error rates based on the number of bytes read during the test. This permits the method to identify a disk drive as having failed its test prior to completion of the full disk drive test cycle.

Claims

1. A computerized method for dynamically measuring hard disk error rate performance during a computer disk test procedure, the method comprising the steps of:

(a) the computer reading stored disk parameters of a disk drive under test, said parameters including disk identification information and predetermined acceptable error rates;

(b) the computer writing a data pattern to a track on said disk drive under test, said disk drive having a plurality of tracks, each of said tracks comprised of a plurality of disk sectors,

(c) the computer totaling the number of bytes being read from said disk drive under test with each read operation;

(d) the computer reading said disk track and receiving a success code or one of a plurality of error codes upon reading said disk track, each of said error codes indicating an error type, where the receipt of one of said plurality of error codes causes said disk track to be characterized as a faulty track;

(e) the computer, upon receipt of an error code upon reading said disk track,

(1) determining which of said sectors within said track caused said error code to be generated, said sector causing said error code to be generated being characterized as a faulty sector;

(2) determining said error type for said faulty sector based on said error code, and determining an address and associated error information for said faulty sector;

(3) storing said faulty sector address, said error type and said associated error information in an error log;

(4) totaling the number of disk errors of each of said error types;

(5) determining whether the number of disk errors for any of said error types exceeds said predetermined acceptable error rates based on said total number of bytes read from said disk drive;

(6) indicating a failure condition when said disk errors have exceeded predetermined acceptable error rates;

(7) halting the disk test procedure when said predetermined acceptable error rates have been exceeded; and

(f) the computer repeating steps (b)-(e) until completion of the disk test procedure or until the computer halts the disk test procedure.

2. The method of claim 1, where said step of determining said faulty sector address includes the steps of:

the computer disabling any onboard cache and direct memory access for said disk drive under test;

the computer rereading all sectors within said faulty track after disabling said onboard cache and direct memory access;

the computer receiving a return code indicating a successful or failed read for each sector within said disk track;

the computer identifying said sectors causing said return codes to indicate a failed read return code as faulty sectors and returning said faulty sector addresses; and

the computer enabling said onboard cache and direct memory access.

3. The method of claim 1, further including the steps of:

the computer determining if all of said sectors within said faulting disk track are faulty sectors and formatting said faulting track; and

the computer deallocating said faulty sector addresses where said faulty track does not include all faulty sectors.

4. The method of claim 1, wherein said step of storing said faulty sector address includes the steps of:

the computer determining if said faulty sector address is already in an error log;

the computer increasing the total number of errors for the appropriate error type;

the computer selectively adding said faulty sector address, said error type and said error information to said error log, where said faulty sector address already appears in said error log.

5. The method of claim 4, wherein the step of selectively adding said faulty sector address, said error type and said error information further includes the steps of:

the computer determining whether said disk drive under test includes a map of predetermined sector addresses, said predetermined sector addresses known to be faulty sectors;

the computer loading said predetermined sector addresses into said error log;

the computer not adding said faulty sector address, said error type and said error information for said faulty sector where said faulting sector address is one of said predetermined sector addresses.

6. The method of claim 1, wherein the steps (a)-(f) are perforated on a computer incorporating said disk drive under test.