如果在选购移动硬盘时被店员问及需要的是串口还是并口？请跟他好好说，谢谢，我只是看看，然后掉头就走，不要浪费时间！以下是为什么:
移动硬盘就是外置硬盘，不是接在电脑机箱内部的那种。请记住：移动硬盘 = 硬盘 + 硬盘盒，硬盘通过电源线和数据线连接在硬盘盒内，装有硬盘的硬盘盒再通过电源线和数据线连接在电脑上。所以，选购移动硬盘要考虑硬盘盒内有是否有对应硬盘接口的数据线，以及硬盘盒外和电脑上是否是否有相对应的接口。
（0）数据线及其接口的不同反映了数据传输速度的不同。
（1）硬盘盒内的数据线对应于硬盘的数据接口，硬盘的数据接口有分IDE,SCSI,和SATA，相应的硬盘也叫做IDE,SCSI,和SATA硬盘。
IDE又叫做Parallel ATA，SATA则是Serial ATA的简写，中文翻译过来前者叫并行ATA，后者叫串行ATA，这和什么“串口”和“并口”完全是两码事！“串口”和“并口”英文翻译过来叫Serial Port和Parallel Port，他们的数据传输速度非常的低，是绝对不会用在硬盘上的！
如果选购Serial ATA硬盘，请注意它的价格要贵一点！如果选购IDE硬盘，记得区分下面几种规格。由上而下，它们代表了传输速率的增加！
ATA-1
ATA-2
ATA-3
ATA-4
Ultra ATA/33
Ultra ATA/66
Ultra ATA/100
Ultra ATA/133
此外还得区分硬盘转速的不同，转速高当然就好些：
5400rpm
7200rpm
以及硬盘的尺寸，3.5“是台式机使用的那种硬盘，2.5"是笔记本电脑使用的那种硬盘：
5.25 inches
3.5 inches
2.5 inches
（2） 硬盘盒外的数据接口可以是USB、IEEE1394、eSATA，最常用的是USB 2.0，其他的应用都比较受限制。
（3）硬盘盒的尺寸是根据所装东西的大小来定义的，5.25”是用来装光驱的，2.5“是用来装笔记本那种硬盘的，3.5“是用来装台式机的那种硬盘。硬盘盒有分铝或者金属外壳和塑料外壳，前者散热比较好，如果还有个小风扇就更好了。当然，要试试看外置盒运转起来是否噪音比较小！
现在应该明白为什么那个店员值得鄙视了吧，别总以为老百姓可以糊弄，考古挖坑是个人都会！这次你可找到他直接明白的说：
我想买一个移动硬盘，要7200转的IDE Ultra ATA/133或者Serial ATA硬盘，外置盒是USB 2.0接口，3.5 inches大，散热好，噪音小，请问有什么选择没有？
他要是听不明白，请跟他说，你去旁边帮我问问，别串口并口的，呵呵！
下面是考古的帖子：
硬盘传输接口
硬盘盒
The official external ENCLOSURE thread
The Break Up Song
Here you can see the wonderful Ukulele!
Lyrics
dont think about the times we have to try to make things last,
dont think about the times when we first kissed you say we wouldnt race to fast,
dont think about the times we have to try to make things right,
cause you and i both know we always get into little fights,
cause love is not the best thing for us now,
its not the best thing for us now,
so im a break it off with you somehow,
the stars would shine for you another day, another day,
so im a try nd love you some other day,
im know im not in need for love,
for love, for love, for love,
my heartache should have been enough for you,
just get on with your life, your life, she say,
wanna be my wife, i say,
gotta make you right before
i get back on my feet, my feet,
get back on my feet,
cause love is not the best thing for us now,
its not the best thing for us now,
so im a break it off with you some how,
the stars would shine for you another day, another day,
so im a try and love you some other way,
dont think about us breakin up
think about you and me makin love
n' think about the lord above
n' thank him for the gift of love
you and i we gotta split apart
n' take a wrong journey through the dark
n' nows the time you got to be strong
just make sure your love carries on
Lyrics
dont think about the times we have to try to make things last,
dont think about the times when we first kissed you say we wouldnt race to fast,
dont think about the times we have to try to make things right,
cause you and i both know we always get into little fights,
cause love is not the best thing for us now,
its not the best thing for us now,
so im a break it off with you somehow,
the stars would shine for you another day, another day,
so im a try nd love you some other day,
im know im not in need for love,
for love, for love, for love,
my heartache should have been enough for you,
just get on with your life, your life, she say,
wanna be my wife, i say,
gotta make you right before
i get back on my feet, my feet,
get back on my feet,
cause love is not the best thing for us now,
its not the best thing for us now,
so im a break it off with you some how,
the stars would shine for you another day, another day,
so im a try and love you some other way,
dont think about us breakin up
think about you and me makin love
n' think about the lord above
n' thank him for the gift of love
you and i we gotta split apart
n' take a wrong journey through the dark
n' nows the time you got to be strong
just make sure your love carries on
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