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I-O DATA Out with HDPS-U Portable Hard-Drives

btarunr

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#1
I-O Data released its newest lineup of portable hard-drives under the HDPS-U series. The drives come in capacities of 160 GB, 250 GB, 320 GB and 500 GB in black and white shells. Connectivity includes USB 2.0 for transfer speeds of 43 MB/s, 39 MB/s (read/write).

The shell encloses a 2.5 inch hard drive which is protected from mechanical damage by a reinforced frame with rubberised corner grips. The unit weighs around 170g. The company will be shipping these drives by mid-December in Japan, with price tags of roughly US $110, $121, $166 and $221 depending on the capacities in the above order.

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Mussels

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#2
i'd like to know how they reckon you can get 43MB/s, i've never seen a USB 2.0 device break past 30 (sustained)
 

btarunr

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#3
i'd like to know how they reckon you can get 43MB/s, i've never seen a USB 2.0 device break past 30 (sustained)
Theoretical limit for USB 2.0 is 60 MB/s, so with a good-enough controller, 43 MB/s doesn't look a stretch.
 

Mussels

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#4
Theoretical limit for USB 2.0 is 60 MB/s, so with a good-enough controller, 43 MB/s doesn't look a stretch.
thats bi-directional. 30MB/s each way, to my knowledge.

If a 1TB 3.5" drive can do 80MB/s on e-sata, yet over USB (with 4 cages i tested) it caps out at 2.9-30MB/s each time, i'd be inclined to think its USB holding it back and not the cages.
 

btarunr

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#5
Although the bandwidth for USB 2.0 isn't 60 MB/s in each direction , it's not fixed to 30 MB/s /direction a-la PCI-Express (250 MB/s /direction /lane). Within its 60 MB/s limit, it can even be 59 MB/s up, 1 MB/s dn theoretically. Since those tests were conducted as read-speed and write-speed, those speeds given out don't look fishy.
 

Mussels

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#6
Although the bandwidth for USB 2.0 isn't 60 MB/s in each direction , it's not fixed to 30 MB/s /direction a-la PCI-Express (250 MB/s /direction /lane). Within its 60 MB/s limit, it can even be 59 MB/s up, 1 MB/s dn theoretically. Since those tests were conducted as read-speed and write-speed, those speeds given out don't look fishy.
ah, ok.

well, i'll wait til i see reviews before beleiving it.
 

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#7
I don't believe it either. I've never seen a USB device sustain transfers over 32-35MB/s. They are probably quoting peak speeds