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Re: Why my USB card reader's reading/writing speed is so slow on OSX 10.2?

Subject: Re: Why my USB card reader's reading/writing speed is so slow on OSX 10.2?
From: Garth Cummings <email@hidden>
Date: Tue, 18 Nov 2003 09:10:03 -0800

Hi Robin,

On Nov 17, 2003, at 5:51 PM, Robin wrote:

Hi, all
I found a strange phenomena on my USB card reader, when I got 0x28/0x2A 10 bytes read/write SCSI command from upper layer , the data length in the CDB always to be 1/2/4 sectors, no matter how big the copying files are. I do not know how the upper layer control yhe data length, but the result is that reading/writing memory card would be very slow. I doubt it's the upper layer sent down data blocks size is too small so that the read/write speed is si slow, what can I do in my driver?

I heard someone else said that in some newsgroup, is it a system driver problem? How to control the data block size from upper SCSI layer? And, it won't happen on OS9.2/Windows platform, so it may not be the hardware bug.

Thanks&regards,
Robin Wang

Why do you have a driver for your reader at all? Isn't it USB Mass Storage Class-compliant?

Thanks,
--gc
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	>Why my USB card reader's reading/writing speed is so slow on OSX 10.2? (From: "Robin" <email@hidden>)

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