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A Buffer Test method for the HDD mounted large size buffer

IP.com Disclosure Number: IPCOM000015950D
Original Publication Date: 2002-Jul-20
Included in the Prior Art Database: 2003-Jun-21
Document File: 4 page(s) / 87K

Publishing Venue

IBM

Abstract

Definitions: HDD: Hard Disk Drive Ready: The state in which HDD can receive a command now. starting time: The time from power on to Ready. buffer size: Size of DRAM area which is used for Read/Write processing. Solved Problem: Starting time is an important element for HDD. However, with the conventional DRAM test method, if the buffer size mounted in HDD increases, starting time will be extended with it. Main points: The Starting time is shortened by dividing DRAM test into 2 times, the midst of starting and the after of it, although conventional DRAM test was being performed in Power-up at once. Moreover, a host system does not need to carry out special processing for changing buffer area which is able to be used for processing, since the timing which changes the buffer area tested after Ready so that HDD can use it is synchronized with the event from a host system.

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A Buffer Test method for the HDD mounted large size buffer

Definitions: HDD: Hard Disk Drive Ready: The state in which HDD can receive a command now. starting time: The time from power on to Ready.
buffer size: Size of DRAM area which is used for Read/Write processing.

Solved Problem: Starting time is an important element for HDD. However, with the conventional DRAM test method, if the buffer size mounted in HDD increases, starting time will be extended with it.

Main points: The Starting time is shortened by dividing DRAM test into 2 times, the midst of starting and the after of it, although conventional DRAM test was being performed in Power-up at once. Moreover, a host system does not need to carry out special processing for changing buffer area which is able to be used for processing, since the timing which changes the buffer area tested after Ready so that HDD can use it is synchronized with the event from a host system.

Details: Before using the mounted buffer after power on, HDD tests whether read-out/writing from/to a buffer correctly, and after checking that it is satisfactory, it starts use of a buffer. Then operation becomes possible after setting an initial configuration required for HDD.

In the conventional DRAM test, since buffer size was sufficiently small, all area was able to be tested by using the time of the waiting for regular rotation of a disk. However, in order to aim at a performance rise of HDD these days, buffer size tends to become large and starting time will become long by the conventional method.

In this new method, the buffer area of necessary minimum is tested immediately after power on, and it is set to as Read...