"I have all the information saved on my hard drive."  

我把所有的信息都保存在我的硬盘上了。

"I finished the presentation preparation and I saved it on my hard drive."

我完成了前期的准备工作，并且把它保存在我的硬盘上了。

"I have the documents you are looking for saved on my computer." 

你要找的文件已经存在我电脑上了。

"I have the information on my computer. Do you want me to put it on a floppy disk for you?"

我把信息保存在我的电脑上，你要我把它放在软盘上吗?

When you say something like, 'saved on my computer', it is understood that you are referring to the hard drive, so in this situation, you can use the two words interchangeably. 

当你说“保存在我的电脑上”的时候，就会理解为你指的是硬盘，所以在这种情况下，你可以交替使用这两个词。

"I'm running out of room on my hard drive." 

我硬盘储存不足了。

"I need a bigger hard drive." 

我需要一个储存大点的硬盘。

"I have the information on my computer, but I think I will need to prepare hard copies for the meeting."

我把信息保存在我的电脑上，但我想我需要用硬盘保存一份用于会议上。

Hard copy refers to something that is tangible. For example, a hard copy of a report is a printed out version on paper. A soft copy is the file stored on the computer. 

硬盘拷贝是指有形的东西。例如，报告的硬盘拷贝是打印出来的版本，软盘拷贝是存储在计算机上的文件。