US 2002/0057510 A1 · Method and apparatus for read error recovery

Abstract

A read error recovery procedure is disclosed that administers subsequent accesses of a track of a disc drive following an initial access of the track wherein multiple errors were encountered as data stored on the sectors was retrieved by a read/write head. During the initial access, the procedure logs information pertaining to the sectors on the disc where an error occurred. The logged information is then used during the read error recovery procedure to retrieve data from the sectors in a single revolution of the disc. The read error recovery procedure uses a skip mask, a vector buffer management list and a data throttling mechanism to administer a transfer of data from a disc to a host computer via a data buffer.

Claims30

Dependent claims

A method for accessing a data segment recorded on a track on a data storage disc in a disc drive, the disc having one or more tracks with a plurality of sequentially arranged data sectors accessible by a read/write head, the method comprising steps of:

(a) accessing a target sector of the data segment and reading data stored on the target sector via the read/write head;
(b) accessing each additional sector of the data segment in ascending order from the target sector and reading data stored on each additional sector via the read/write head;
(c) generating an instruction list such that the instruction list identifies each sector of the data segment on which an error is encountered;
and
(d) executing a read error recovery procedure enabling data from each sector on which an error was encountered to be accessed during a single revolution of the disc as the disc is accessed by the read/write head.

2 more elements

In a disc drive having a data storage disc having one or more tracks thereon with a plurality of sequentially arranged data sectors accessible by a read/write head, a method for reading data in a data segment on the disc comprising steps of:

(a) performing an initial read of the data segment during a first access of the track wherein a plurality of errors may be encountered on a plurality of sectors of the data segment as the data segment is being initially read;
and
(b) during a single revolution of the track and a subsequent access of the data segment, performing a re-read of the data recorded on each sector of the data segment on which an error was encountered.

A disc drive having a data storage disc, an actuator for positioning a transducer over the data storage disc and a disc controller for communicating with a host computer, controlling position of the actuator and controlling access to sequentially arranged data sectors on tracks on the data storage disc, the disc drive comprising:

a buffer having sequentially arranged buffer sectors;
a read/write channel receiving data retrieved from the disc by the transducer;
an interface between the read/write channel and the buffer, the interface transmitting data read through the read/write channel to the buffer sectors of the buffer;
a formatter between the interface and the read/write channel for timing when data is transferred between the interface and the read/write channel;
a buffer manager building and updating a vector buffer manager list which indicates an order in which the buffer may be accessed;
and
a skip mask mechanism operably connected to the formatter providing an instruction list directing the formatter whether to enable a passage of data between the interface and the read/write channel for each sequentially accessed sector on a data segment being read pursuant to a read command from the host computer.

4 more elements

Dependencies are inferred from the claim text.

Method and apparatus for read error recovery

Life of this patent

Method and apparatus for read error recovery

Life of this patent

Abstract

Claims30