Re: Weird USB Enclosure behaviour

Previously Siddhartha Jain <reach.siddhartha@xxxxxxxxx> wrote:
> Hi,

> I bought a Samsung CDRW Drive (SH-522) and a Adcom 5.25" USB HDD
> enclosure. Put the CDRW drive in the enclosure and plugged it to the
> USB 2.0 port of my laptop. Windows 2000 and Linux on my laptop, both,
> detect the drive as a USB Mass Storage device but are unable to read
> from it. Windows doesn't assign it a drive letter but in the hotplug
> list I can see a "USB Mass storage disk" device. The Linux logs show a
> USB Mass storage device getting detected but shows buffer I/O errors
> and several resets to the device. At this point, I assumed that either
> one of them was faulty, the CDRW DRive or the enclosure.

> Next, I plug a 20GB HDD in the 5.25" enclosure and it worked fine!!
> Thats one. Two, I plugged in an older CDROM drive in the enclosure and
> that worked fine too!! Ok, I thought maybe the CDRW is bad.

> Now, I plugged in the CDRW in a PC on the IDE bus and guess what? It
> works!! Test two - I took out the connector board from a 3.5" USB
> enclosure and plugged the CDRW drive to it and it worked!!!

> To conclude, the 5.25" USB enclosure works with a seagate HDD and a
> CDROM drive. The Samsung CDRW drive works directly on the IDE bus in a
> PC and works with another 3.5" USB HDD Enclosure. But the 5.25" and
> Samsung CDRW don't work together.

> All this left me scratching my head. Can you make anything out of it?

USB to IDE converters are notoriously incompatible in the strangest
ways. I have now tried 6 different ones and not a single one
worked correct for the different HDDs I tried with. Exception:
I tried my Agrosy enclosure only with Seagate and Maxtor 3.5"
disks. Don't know whether it has problems with Samsung or
notebook HDDs.

Arno

.

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