Re: Best USB2 to Ultra ATA 100 adapter card or external HDD?

#1 01-05-2006, 02:14 AM

mike wrote:
> Knack wrote:
> > I just set up what I thought was the mostly robustly constructed portable
> > 3.5" HDD external enclosure for USB 2.0. The case has an extruded aluminum
> > shell with cooling ribs on two faces and vented openings on the ends for air
> > circulation. It also has an external power adapter for converting 120 VAC to
> > the required DC voltages. It is a KingWin KM-H31-U2-01 (sometimes called a
> > MAP-H31 by other brands).
> >
> > Last night I used it for the first time and did a backup with it. But today
> > it won't spin up either of two brand new Ultra ATA HDDs that I've tried in
> > it.
> >
> > Here are the voltages at the HDD's power connector:
> > black #1 +5.11 vdc
> > black #2 +5.11 vdc
> > yellow -6.91 vdc
> >
> > Is the external power supply adapter bad, or is there something wrong with
> > the enclosure's circuit card?
> >
> > BTW, the transfer rate last night was terrible: averaged only 3.17 MB/sec
> > over a period of 24 mins.
> >
> > Does anyone know of the best make & model card for the external enclosure?
> >
>
> If you dig around on the forums, you'll read many horror stories about
> reliabiltiy of these devices.
> First thing I'd do is replace the power supply. It may be fine with no
> load, but folding up under load causing the drive to shut down.
>
> I'd be interested to hear what data transfer rates people are really
> getting with USB2. I'm only capable of about 3MB/S to a usb2 flash card
> that's spec'd at 10MB/s write speed. I only get 6MB/S over a 100Mb
> ethernet connection. My 100MB/S disk drive benchmarks at 1/3 that.
>
> Bottom line is that each device is specified under ideal conditions.
> A system of two such devices rarely achieves that rate.
>
> mike
> --

what do you use to measure those transfer speeds?

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Portable Media Device	Arkay	Windows XP Photos	4	01-05-2006 07:11 AM
canon camera A520 cannot upload images to computer	foobalkif4	Windows XP Photos	9	01-05-2006 07:11 AM
Photo copy from camera keeps stopping	Paul F	Windows XP Photos	4	01-05-2006 07:08 AM
Re: Best USB2 to Ultra ATA 100 adapter card or external HDD?	jameshanley39@yahoo.co.uk	Windows XP Hardware	0	01-05-2006 02:15 AM
Re: Best USB2 to Ultra ATA 100 adapter card or external HDD?	jameshanley39@yahoo.co.uk	Windows XP Hardware	0	01-05-2006 02:14 AM