公开(公告)号：AT510280T

公开(公告)日：2011-06-15

申请号：AT08774530

申请日：2008-06-30

Applicant: IBM

Inventor： BATES ALLEN ,  HAUSTEIN NILS ,  KLEIN CRAIG ,  WINARSKI DANIEL

IPC: G11B7/0065

Abstract: A holographic storage drive and control of a holographic storage system are configured to write at least a group of holograms in a predetermined pattern in the holographic storage medium, and to write a directory hologram which relates to the holograms of the group to form an anchor location of the predetermined pattern. Further, a directory comprising the directory hologram stored in a memory, and the control is configured to initiate a read operation of at least one hologram of a group with an access for the directory hologram of the group at the anchor location; to read the accessed hologram, employing a matched filter to cross-correlate the read accessed hologram with an ideal version of the directory hologram derived from the directory stored in the memory; and to determine whether the read accessed hoIogram is the directory hoIogram of the group.

公开(公告)号：AT504980T

公开(公告)日：2011-04-15

申请号：AT08786514

申请日：2008-07-28

Applicant: IBM

Inventor： BATES ALLEN ,  HAUSTEIN NILS ,  KLEIN CRAIG ,  WINARSKI DANIEL

IPC: H03M13/23

Abstract: An apparatus and method are disclosed to generate convolution encoded data. The method supplies a convolution encoder. The method receives original data and generates convolution encoded original data. The method receives revised data. The method generates an XOR data stream by Exclusive OR'ing the original data with the revised data, forms a convolution encoded XOR data stream using the convolution encoder, and Exclusive ORs the convolution encoded XOR data stream with the convolution encoded original data to generate convolution-encoded revised data.

公开(公告)号：AT475174T

公开(公告)日：2010-08-15

申请号：AT08736131

申请日：2008-04-11

Applicant: IBM

Inventor： WINARSKI DANIEL ,  BATES ALLEN ,  KLEIN CRAIG ,  HAUSTEIN NILS

IPC: G11B7/0065 ,  G11B7/09 ,  G11B7/24 ,  G11B7/24038 ,  G11B7/24044

Abstract: A dual-path optical recording medium (100) and an apparatus (200) for accessing such are disclosed. The dual-path optical recording medium (100) includes a substrate (114), an intermediate recording layer (118), a holographic recording layer (104) and a dichronic mirror layer (110). The intermediate recording layer (118) is a rewritable data storage layer with a relatively low storage capacity. The holographic recording layer (104) is a write-once data storage layer with a relatively high storage capacity. The dichronic mirror layer (110) is located between the holographic recording layer (104) and the intermediate recording layer (118). The apparatus (200) for accessing the dual-path optical recording medium (100) includes a first light module (131) capable of generating a first laser light (121), and a second light module (132) capable of generating a second laser light (122).