Pre-Grant Publication Number: 20110138120
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Prior Art Detail
Summary / Description
| Summary / Description | data processing system with a hierarchical memory. The memory comprises at least a single memory module. The module has a plurality of memory units. Each respective one of the memory units represents arespective level in the hierarchy. Each specific one of the memory units is physically integrated with a particular memory unit of the next higher level. Among the memory units there are an optical disk drive and at least one magnetic disk drive. The magnetic disk drive serves as a read cache for the optical disk drive. The magnetic disk drive is physically integrated with the optical disk drive. |
Basic Information
| Type of Prior Art | Issued Patents - US |
| Country | United States of America |
| Patent/Application # | 6070226 |
| Kind Code | United States (US) - United STATES Patent - A |
| Patentee Name | M FREEMAN et al. |
| Relevant Pages, Columns, or Lines | col. 1, ln 40- col. 2, ln 18 |
| URL | |
| Filing Date | December 10, 2000 |
| Additional Information | |
Notes / To Do
| Notes | |
Excerpt
Excerpt The inventors have realized that providing a consumer electronics system with such a memory hierarchy solves the problem of unacceptable latency inherent in optical disk storage. The concept of memory hierarchy allows the matching of highercapacity, lower speed storage to lower capacity, higher speed storage in order to achieve high-speed storage data rates with high storage capacity. In a memory hierarchy, higher data transfer rates are achieved by staging data in progressively faster,smaller storage with the fastest and smallest storage interfacing directly to the processor. Using a small capacity, higher performance magnetic disk drive as a staging device for a lower performance, higher capacity optical disk drive like a CDROMoffers performance advantages.
There are several ways of controlling this staging device. These ways include a transparent caching strategy where the next level up in the memory hierarchy only sees a faster acting optical disk drive, and a program controlled strategy wherethe software actually manages the accessing and the movement of data between the magnetic and optical disk drives.
If data to be accessed is found on the magnetic disk drive, the data access occurs at magnetic disk drive rates. Otherwise, the data must be fetched from the optical disk drive and also written to the magnetic disk drive in the expectation offuture re-use. While initial accesses to information on the combined pair may be slow, as data becomes populated on the magnetic disk drive, the access times will improve to an acceptable level. Applications knowing about the memory hierarchy can takeadvantage of its capabilities even more by pre-fetching data and program that have a high probability of being required in the future. Thus, if a branch condition determines which of two different data accesses to make, having pre-fetched bothprogram/data segments previously provides the highest performance |
Relevance
Claims
1
Relevance
The inventive concept here, with the ODD having a built in memory cache is an idea patented in the submitted patent. While this patent from 2000 uses a magnetic disk drive as the memory cache, it is similarly built into the ODD and serves the same purpose as the the flash memory of this application which serves as the memory cache.
The inventive concept here, with the ODD having a built in memory cache is an idea patented in the submitted patent. While this patent from 2000 uses a magnetic disk drive as the memory cache, it is similarly built into the ODD and serves the same purpose as the the flash memory of this application which serves as the memory cache.
Claim Chart
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