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

btarunr · Nov 28, 2008, 10:16 AM

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.

Source: I-O DATA

Mussels · Nov 29, 2008, 02:47 AM

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 · Nov 29, 2008, 02:53 AM

Quote:

Originally Posted by Mussels

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 · Nov 29, 2008, 02:56 AM

Quote:

Originally Posted by btarunr

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 · Nov 29, 2008, 03:03 AM

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 · Nov 29, 2008, 03:10 AM

Quote:

Originally Posted by btarunr

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.

Wile E · Nov 29, 2008, 08:25 AM

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

Nov 28, 2008, 10:16 AM	#1
btarunr Editor & Senior Moderator Join Date: Oct 2007 Location: Hyderabad, India Posts: 14,983 (7.29/day) Thanks: 788 Thanked 12,911 Times in 5,655 Posts System Specs	I-O DATA Out with HDPS-U Portable Hard-Drives 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. Source: I-O DATA

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Nov 29, 2008, 02:47 AM	#2
Mussels Doctor Moderator Join Date: Oct 2004 Location: Bendigo, Australia (NOT THE USA) Posts: 34,561 (10.96/day) Thanks: 3,700 Thanked 8,697 Times in 6,394 Posts System Specs	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) __________________ Edumacational thread about PC Audio My external HDD's.5x samsung 1TB + 2x Seagate 1.5TB = 8 TB external storage 32 Bit OS vs 64 bit OS information How to get hardware accelerated H264 playback (DXVA) Netbook Owners United!

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Nov 29, 2008, 03:03 AM	#5
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Nov 29, 2008, 08:25 AM	#7
Wile E Power User Join Date: Oct 2006 Location: Western PA (Pittsburgh suburbs) Posts: 18,129 (7.47/day) Thanks: 450 Thanked 3,826 Times in 3,124 Posts System Specs	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 __________________ Visit Ashentech “What the hell did you expect? Leave Vista under the pillow and the OS fairy would make it Win7?” -El Fiendo “And Bring Mailman back god damnit, he is the Eric Cartman of TPU” -MRCL

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