Electrical computers and digital processing systems: memory – Storage accessing and control – Specific memory composition
Reexamination Certificate
2000-03-28
2003-07-08
Bragdon, Reginald G. (Department: 2188)
Electrical computers and digital processing systems: memory
Storage accessing and control
Specific memory composition
C711S004000, C707S793000
Reexamination Certificate
active
06591333
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a method of recording a file, which includes multiple subsets of data and is incompletely recorded on a first track of an optical disk during a previous recording operation, on a second track of the optical disk.
BACKGROUND OF THE INVENTION
Recently the industries have paid attention on storing data in ISO 9660 format on an optical disk. As the data are stored on a disk in ISO 9660 format, the CD-R or CD-RW is used to denote the disk. Hereinafter, a CD-R system is taken as an example to illustrate the present invention.
Referring to
FIG. 1
, the construction of a typical CD-R recording system
11
, to which an optical disk write (recording) method described later is applied, is shown. The CD-R recording system
11
includes a CD-R drive
12
and a host computer
13
which sends out the recording commands to the CD-R drive
12
. The CD-R drive
12
performs data write/read processes on a disk
21
in accordance with a command from the host computer
13
on signal line
35
.
A write/read part
14
of the CD-R drive
12
includes a spindle motor
22
for rotating the disk
21
, a pickup (PU)
23
for projecting a laser beam to a target track on the disk
21
, a pickup feeding mechanism
24
for translating the pickup
23
in a radial direction of the disk
21
, and a head amplifier
25
for converting a restored signal received (restored) by the pickup
23
into a signal having a predetermined level on line
251
. The write/read part
14
also includes a servo circuit
26
for generating a wobble servo signal that controls the spindle motor
22
, and for controlling the position of the pickup
23
, an encoder
31
, and a CPU
33
serving as a controller for controlling the entirety of the CD-R drive
12
.
The CD-R drive
12
has an interface circuit, hereinafter referred to as I/F
34
, and a buffer
32
. The buffer
32
has a predetermined data storage capacity and stores data supplied thereto by the host computer
13
. For example, the buffer
32
may have a capacity of 3 megabytes. An FIFO (first in first out) scheme, for example, is employed in the buffer
32
. The encoder
31
subjects the data supplied from the buffer
32
to EFM modulation, together with subcodes, in accordance with a predetermined standard, and supplies the modulated data to the pickup
23
.
The CPU
33
is equipped with a ROM and a RAM (not shown). The CPU
33
is connected to the I/F
34
via a bus
37
including multiple data signal lines and at least one control signal line, and to the buffer
32
via a control signal line. The buffer
32
is connected to the I/F
34
via a bus
39
.
As well known in the arts, the guide grooves (pregrooves) that are optically detectable are formed at track positions on the disk
21
before the disk
21
stores any data. The servo circuit
26
generates a track signal and a focus signal based on the signal on line
251
supplied from the head amplifier
25
, and supplies the track signal and the focus signal to control the pickup
23
. The servo circuit
26
generates a wobble signal and supplies the same to the spindle motor
22
. Accordingly, the pickup
23
remains aligned with the target track on the disk
21
and the rotation of the disk
21
is controlled to have a constant speed with respect to the pickup
23
.
The host computer
13
includes a CPU block
41
, a hard disk drive (HDD)
42
, an I/F
43
for interfacing with the CD-R drive
12
, a display
45
, and an input unit
44
. In general, a plurality of files to be recorded on the disk
21
are stored in the HDD
42
.
The CPU block
41
includes a CPU, a ROM (not shown), a RAM (not shown), and an interface circuit (not shown) with the HDD
42
. The CPU block
41
is connected to the I/F
43
via a bus
46
including multiple data signal lines and at least one control signal line. The I/F
43
is connected to the I/F
34
of the CD-R drive
12
via a bus
35
including multiple data signal lines and at least one control signal line. The host computer
13
may be embodied by an ordinary personal computer.
In the CPU block
41
, a driver for interfacing with a user and a write (recording) utility program is executed during file recording operation. The write utility program is used to manage the recording operation on the disk
21
.
In “Orange Book Part II”, the CD-R standards on which the prior art methods are based is disclosed. Prior art disk write methods, including disk-at-once method, track-at-once method and session-at-once method, have been extensively practiced in a conventional optical disk recording system.
The term ‘track’ used hereinafter represents a continuous stream of information and is not to be confused with the physical concentric ‘tracks’ in the configuration of the optical disk. It is noted that an optical disk is generally structured into one or more tracks where a track represents an organized unit of information.
The prior art methods are suitable for high speed data recording operation. However, the prior art methods require that a continuous and uninterrupted stream of data is to be written. If the data flow is interrupted during recording operation, the medium is rendered useless. This is a result of the inability to locate the position of the last written data. An interruption of the data recording is referred to as an under-run condition.
The foregoing and other state-of-the-art optical disk write approaches indicate a need for a new method for completing recording of a file which is incompletely or unsuccessfully recorded due to under-run condition.
SUMMARY OF THE INVENTION
It is an objective of the invention to provide a method for completing recording of a file on a second track of a disk. The file, which includes multiple subsets of data, is incompletely recorded on a first track of the disk during a previous recording operation.
According to the invention, the method first reads content of a file logical information recorded on the first track. Secondly, the method, based on content of the file logical information, detects one subset data, meaning subset of data, of the multiple subsets of data corresponding to the file logical information, as being not recorded on the first track of disk. Afterwards, the method determines if an initial recording position of the one subset data obtained in previous step is larger than a start position of the second track. If it is yes in previous step, the method stores a file logical information corresponding to the one subset data into a recording index table. Finally, the method, according to the recording index table, records the one subset data on the second track.
The advantage and spirit of the invention may be understood by the following recitations together with the appended drawings.
REFERENCES:
patent: 5774431 (1998-06-01), Bos et al.
patent: 6401168 (2002-06-01), Williams et al.
patent: 6401169 (2002-06-01), McMurdie et al.
patent: 6405283 (2002-06-01), James
Chuang Yen-Hui
Yen Meng-Shin
BenQ Corporation
Birch & Stewart Kolasch & Birch, LLP
Bragdon Reginald G.
Vital Pierre M.
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