US 7,321,721 B2
Hard disk apparatus, medium, and collection of information
Yoshiki Kuno, Moriguchi (Japan); Toshikazu Koudo, Nishinomiya (Japan); Yoshitaka Yaguchi, Takatsuki (Japan); Noriaki Kubo, Takatsuki (Japan); Kenichiro Yamauchi, Nagaokakyo (Japan); and Ryuichiro Tanaka, Kyoto (Japan)
Assigned to Matsushita Electric Industrial Co., Ltd., Osaka (Japan)
Appl. No. 10/240,181
PCT Filed Mar. 26, 2001, PCT No. PCT/JP01/02404
§ 371(c)(1), (2), (4) Date Aug. 06, 2003,
PCT Pub. No. WO01/78076, PCT Pub. Date Oct. 18, 2001.
Claims priority of application No. 2000-89690 (JP), filed on Mar. 28, 2000.
Prior Publication US 2004/0022526 A1, Feb. 05, 2004
Int. Cl. H04N 5/00 (2006.01); H04N 7/00 (2006.01); H04N 9/79 (2006.01)
U.S. Cl. 386—125  [386/45; 386/105] 2 Claims
OG exemplary drawing
 
1. A hard disk apparatus comprising:
recording means of recording AV data onto a hard disk; and
stream controlling means, coupled to the recording means, of processing the signal of AV data transmitted from an interface or the signal of AV data transmitted to the interface; wherein,
the hard disk apparatus records and/or reproduces the AV data, and wherein,
a size of a disk access unit serving as a minimum continuous unit in the access to the hard disk is set to be equal to or greater than a size obtained by the following Formula (1):

OG Complex Work Unit Drawing
Rch indicates a transfer rate per channel, D indicates the size of the disk access unit to be determined, T indicates a process time necessary for recording or reproducing the data of size D, and T is set to be a value equal to the greater value of T1 obtained from the following Formula (2) and T2 obtained from the following Formula (3):

OG Complex Work Unit Drawing
T1 indicates a process time necessary for recording or reproducing the data of transfer size D to or from the inner circumference of the magnetic disk, Ri indicates a rate of recording to or reproducing from the inner circumference of the magnetic disk, C indicates a number of channels in multi-channel processing, Sst indicates a time necessary for a settling action, and W indicates a time of rotation waiting,

OG Complex Work Unit Drawing
T2 indicates a process time necessary for recording or reproducing the data of transfer size D to or from both the inner circumference and the outer circumference of the magnetic disks, Ro indicates a rate of recording to or reproducing from the outer circumference of the magnetic disk, and Sfsk indicates a time necessary for a full stroke.