存储类

数字机顶盒中USB大容量存储类主机的设计实现

Design and Realization of USB Mass Storage Class Host in Digital Set-top-box

重点分析了闪存盘使用的USB海量存储类单批量传输协议和FAT文件系统。

The USB Mass Storage Class Bulk-Only Transport Specification and FAT file system is analysised particularly .

创建bin目录来存储类。

Creates the bin directory to store the classes .

如果使用同一个缓存的JVM没有指定modified子选项，就会按一般方式寻找并存储类。

Any JVM using the same cache without the modified suboption finds and stores vanilla classes as normal .

介绍USB设备类（以海量存储类协议为主）以及如何在嵌入式系统中实现USB接口。

Introduce the USB device genus ( Mass Storage ) and how to realize the USB interface in the embedded system .

本课题来源于K公司技术改进实际项目，该公司是一家生产存储类电子产品的大型跨国企业。

This topic is derived from the actual technical improvement project from company K. Company K. is a large multinational enterprise . The main product is storage class electronic device .

当多个JVM在同一台机器上运行时，这将减少存储类数据所需的物理内存量。

This reduces the amount of physical memory required to store class data when multiple JVMs run on the same machine .

待管理的数码相机和MO一般属于海量存储类设备，除了USB海量存储类本身规定了数据传输方式外，还要考虑存储设备使用的透明控制命令集以及FAT文件系统管理等问题。

It should be concerned that control codes used in MO and the management of the FAT file system besides obeying data transfer protocol defined in USB mass storage class specification .

本文详细介绍了在嵌入式场合需要考虑的USB的一些基本特性，重点介绍了怎样在嵌入式场合应用USB大容量存储类设备，并且给出了相应的开发方案。

This paper describes the basic technology behind USB , with emphasis on which of the many implementation details you need to know tc apply USB Mass Storage Device to an embedded system .

对于任意一个类来说，QuotientCube仅仅存储类的上下界，而该类包含的其它单元格可由类的边界推导出来。

For each class , Quotient Cube only saves its upper bound and lower bound ( s ), other cells contained in the class could be induced from the bounds .

最后对软件代码的实现流程做了详细的阐述，由于支持的USB存储类设备多采用控制传输和批量传输，对USB系统软件做了相应的简化，提高了系统的数据传输性能。

Since the control transmission and bulk transmission are in common use in USB mass-storage devices , the system of software in USB HOST in this paper was simplified for the improvement of performance in data transmission .

实验结果表明，遵从海量存储类子协议的USB设备，都能够被系统驱动，而且数据传输速度优于PC机驱动方式。

The experimental results show that USB devices obeying sub-protocols for mass storage class can be driven by the system , and the speed of data transmission driven by the system is faster than that of data transmission driven by PC.

第二章阐述了本设计所遵循的各种通讯协议，包括USB1.1规范、BULK-ONLY传输规范和USB块存储类UFI命令规范；

The second chapter expatiates on all the specification of the design follows , including USB 1.1 specification , Bulk-Only transport specification and UFI command specification ;

在javasharedresources目录中创建一个内存映射文件来存储类数据。

A memory-mapped file is created in a directory called javasharedresources to store the class data .

美光科技公司曾出价约34亿美元来购买Hynix公司的核心芯片业务，并在非存储类芯片业务内占少数股份。

Micron had offered to pay about $ 3.4 billion for Hynix 's core memory business , and to take a minority stake in the non-memory arm .

但是，就在同一天，急需现金的存储类芯片巨人Hynix公司的董事会断然拒绝了美国的一家竞争对手美国美光科技公司的收购建议，此举令市场大为震惊。

But on the same day , the board of Hynix , a cash-strapped memory-chip giant , shocked the markets by rejecting a proposed takeover by Micron Technology , an American competitor .

一个设备管理器可指派给多个存储类。

A device manager can be assigned to many storage classes .

多个存储类可指派给一个移植策略。

Multiple storage classes can be assigned to a migration policy .

字段存储类要满足其设计所需要的数据。

Fields store the data a class needs to fulfill its design .

存储类与设备管理器直接相关。

Storage class has direct association with the device manager .

加密存储类不支持以此格式保存密钥数据。

Cryptographic storage class does not support saving key data in this format .

移植策略要求预定义存储类。

Migration policy requires storage classes to be predefined .

存储类的自动提交行为的成员变量。

Member variable to store the ' automatic commit ' behavior for the class .

存储类指定一个对象将存储为的媒体类型。

A storage class specifies the type of media an object will be stored as .

存储类属性的缺省规则

Default for storage class attribute

一个存储类仅能有一个设备管理器，可指派给一个存储系统。

A storage class can only have one device manager and can be assigned to one storage system .

每个具有自动存储类（3.7.2）对象的实例都与其所在语句块的相应入口相联系。

An instance of each object with automatic storage duration ( 3.7.2 ) is associated with each entry into its block .

请注意，存储类指定的是媒体类型，而非对象将存储到的实际位置。

Note that storage class specifies the type of media , not the actual location where an object will be stored .

此加密存储类不支持仅保存公钥信息。必须同时保存私钥。

Saving only public key information is not supported by this cryptographic storage class . A private key must also be saved .

罗宾逊认为，如今存储类创业公司面临的挑战之一，是要简化过去那种非常复杂和碎片化的格局。

Part of the challenge for storage startups today is to simplify what has become an inordinately complex and fragmented landscape , Robinson says .