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Hardware版 - 请问外置SSD硬盘和内置有差别吗?
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相关话题的讨论汇总
话题: ssd话题: mb话题: sata话题: usb3话题: drive
进入Hardware版参与讨论
1 (共1页)
o******l
发帖数: 108
1
请问外置SSD硬盘是否插上就也能使电脑快点?外置和内置是否一样?在Costco看到外
置的SSD硬盘想买个试试看不知能否让电脑快些。
懂的大牛说说看,多谢!
F***Q
发帖数: 6599
2

esata or USB3? they are hugely different

【在 o******l 的大作中提到】
: 请问外置SSD硬盘是否插上就也能使电脑快点?外置和内置是否一样?在Costco看到外
: 置的SSD硬盘想买个试试看不知能否让电脑快些。
: 懂的大牛说说看,多谢!

a***e
发帖数: 27968
3
没大差

★ 发自iPhone App: ChineseWeb 13

【在 F***Q 的大作中提到】
:
: esata or USB3? they are hugely different

F***Q
发帖数: 6599
4

from the specs, they are similar, but from my experience, esata is a lot
faster than USB3.
esata is basically sata with a different cable. with an SSD drive, I was
able to get 500MB/s speed when cloning between two SSDs. for an external
USB3 drive (non-ssd), I was only able to get ~60 MB/s (reported by iotop in
Ubuntu)
curious what other people got for USB3 external drive (ssd or non-ssd) in
terms of speed.

【在 a***e 的大作中提到】
: 没大差
:
: ★ 发自iPhone App: ChineseWeb 13

a******n
发帖数: 1052
5
我的3.0有300 - 400 MB/s 里头用的840 evo 感觉你这个不是3.0的速度

in

【在 F***Q 的大作中提到】
:
: from the specs, they are similar, but from my experience, esata is a lot
: faster than USB3.
: esata is basically sata with a different cable. with an SSD drive, I was
: able to get 500MB/s speed when cloning between two SSDs. for an external
: USB3 drive (non-ssd), I was only able to get ~60 MB/s (reported by iotop in
: Ubuntu)
: curious what other people got for USB3 external drive (ssd or non-ssd) in
: terms of speed.

F***Q
发帖数: 6599
6

just did the following test:
copy ubuntu-14.04.1-desktop-amd64.iso (975 MB) from an SSD drive to a USB3
external drive (Seagate backup plus drive, non-ssd), it took 11.35 seconds.
iotop reported 85 MB/s, matching the speed from 975/11.35.
copying the same file to another folder on the same ssd drive took only 1.5
to 2.1 seconds, yielding a speed of 975/2.1=451 MB/s.
how long does it take for you to copy that file? you can download a similar
file from
http://ftp.riken.jp/Linux/ubuntu-releases/14.04.1/ubuntu-14.04-desktop-i386.iso

【在 a******n 的大作中提到】
: 我的3.0有300 - 400 MB/s 里头用的840 evo 感觉你这个不是3.0的速度
:
: in

a******n
发帖数: 1052
7
你的85MB是机械硬盘吧 ssd同一个盘拷速度很快啊,用的什么型号,也是SATA?
我的三个盘
SATA 850a (256gb满) 850b (1tb空)
USB 840 (256gb空)
SATA <-> SATA:
850 b to 850 a 1.891s 平均516 MB/s
但是如果850 b to 850 b 就要4.672s 平均209 MB/s 同时读写速度减半还多
SATA <-> USB 3.0:
850 b to 840 2.500s 平均390 MB/s
反过来
840 to 850 b 2.453s 平均397 MB/s
然后840 to 840 要5.109s 平均190 MB/s
另外试了下 SATA -> USB 3.1
SATA 850 b to 840 USB3.1 2.203s 平均443 MB/s
觉得450 MB/s可能840到顶了,3.1应该能更快些

.
5
similar

【在 F***Q 的大作中提到】
:
: just did the following test:
: copy ubuntu-14.04.1-desktop-amd64.iso (975 MB) from an SSD drive to a USB3
: external drive (Seagate backup plus drive, non-ssd), it took 11.35 seconds.
: iotop reported 85 MB/s, matching the speed from 975/11.35.
: copying the same file to another folder on the same ssd drive took only 1.5
: to 2.1 seconds, yielding a speed of 975/2.1=451 MB/s.
: how long does it take for you to copy that file? you can download a similar
: file from
: http://ftp.riken.jp/Linux/ubuntu-releases/14.04.1/ubuntu-14.04-desktop-i386.iso

F***Q
发帖数: 6599
8

that's correct. I believe it is a 2T 5400rpm mechanical drive made by
Seagate.
the SSD is also made by seagate
https://www.amazon.com/Seagate-2-5-Inch-Z-Height-Solid-ST480HM000/dp/
B00CKAOWB6
very informative! this seems to be clear - the bottleneck of using an
external drive is the max disk read/write speed, instead of the interface.
Your benchmark does show that the SATA interface can be 30% faster.

【在 a******n 的大作中提到】
: 你的85MB是机械硬盘吧 ssd同一个盘拷速度很快啊,用的什么型号,也是SATA?
: 我的三个盘
: SATA 850a (256gb满) 850b (1tb空)
: USB 840 (256gb空)
: SATA <-> SATA:
: 850 b to 850 a 1.891s 平均516 MB/s
: 但是如果850 b to 850 b 就要4.672s 平均209 MB/s 同时读写速度减半还多
: SATA <-> USB 3.0:
: 850 b to 840 2.500s 平均390 MB/s
: 反过来

z****8
发帖数: 5023
9
你这不是废话么 瓶颈又不是USB3.0
你那个拷贝慢 瓶颈在希捷机械盘

【在 F***Q 的大作中提到】
:
: that's correct. I believe it is a 2T 5400rpm mechanical drive made by
: Seagate.
: the SSD is also made by seagate
: https://www.amazon.com/Seagate-2-5-Inch-Z-Height-Solid-ST480HM000/dp/
: B00CKAOWB6
: very informative! this seems to be clear - the bottleneck of using an
: external drive is the max disk read/write speed, instead of the interface.
: Your benchmark does show that the SATA interface can be 30% faster.

1 (共1页)
进入Hardware版参与讨论
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相关话题的讨论汇总
话题: ssd话题: mb话题: sata话题: usb3话题: drive