MBP - External Transfer rates MB/s>Mb/s

[Marty62]

Some clarification needed here, is my understanding of the two standards
MB/s and Mb/s ( Megabytes verses Megabits ) correct ?

A quote from an Everythingusb post about these figures :

"During any normal migration from a USB 2.0 to USB 2.0
averaged around 20 MB/s on any drive I've ever used.
Upgrading from the USB 2.0 to a USB 3.0 got me an average of 40 MB/s.
On transferring from USB 3.0 to USB 3.0 I got an average of 58 MB/s. Read the speeds below.
A Low Speed (USB 1.1, USB 2.0) rate of 1.5 Mbit/s (187 kB/s)
that is mostly used for Human Interface Devices (HID) such as keyboards, mice, and joysticks.
A Full Speed (USB 1.1, USB 2.0)rate of 12 Mbit/s (1.5 MB/s). Most USB Hubs support FullSpeed.
A Hi-Speed (USB 2.0) rate of 480 Mbit/s (60 MB/s).
A Super-Speed (USB 3.0) rate of 4.8 Gbit/s (600MB/s)"


SO ... with a new & empty Lacie 7200rpm USB2.0 external drive, if I see a
Speed Disk measurement of say 40 MB/s then this is X8 to get Mb/s, that's
320 Mb/s ... not far from USB2.0 max spec of 480 Mb/s ??

Is this correct ??

Many thanks for clarification OR letting me know if I have this totally wrong !!

Regards,
Martin.

 

[T'hain Esh Kelch]

You are correct.

 

[Marty62]

You are correct.

Many thanks - makes me quite relieved to say the least !!

Martin.

 

[g4cube]

It's not the ca se that is 7200rpm.

But a Modern 7200 or 5400 or 5900 RPM drive should get you close to the 38-40 MB theoretical speed limit. Right drive, right bridge chip inside and you will be happy.

Even better, a true USB 3.0 case will still be best.

 

[Marty62]

It's not the ca se that is 7200rpm.

But a Modern 7200 or 5400 or 5900 RPM drive should get you close to the 38-40 MB theoretical speed limit. Right drive, right bridge chip inside and you will be happy.

Even better, a true USB 3.0 case will still be best.

In this instance, It's a USB3.0 drive on a USB2.0 equipped MBP !!

It still managed approx 43MB/s so 344Mb/s .... not too bad !

Internal SSD managed 485MB/s so ... x 8 3,880Mb/s

M.