From: Matthew Dharm <[EMAIL PROTECTED]> (by way of Steve Calfee <[EMAIL PROTECTED]>)
To: [EMAIL PROTECTED]
Subject: Re: [usb-storage] Re: [linux-usb-devel] Re: YEAH! (was: [Linux-usb-users] Genesys-Based Devices and Nforce2 usb chipset)
Date: Thu, 08 Jul 2004 14:34:42 -0700
On Thu, Jul 08, 2004 at 10:41:15PM +0200, Oliver Neukum wrote:
> Am Donnerstag, 8. Juli 2004 19:52 schrieb Alan Stern:
> > KB because he thought it had to be a power of 2, maybe he had some
> > stronger reason, or maybe he thought the sector size was 1024 rather than
> > 512. (I should try asking; who knows, they might even answer...)
>
> Is it always 512, even on an optical drive?
I've heard of opticals with sectors up to 2048.
Matt
From the usb 2.0 spec:
5.8.3 Bulk Transfer Packet Size Constraints
An endpoint for bulk transfers specifies the maximum data payload size that the endpoint can accept from
or transmit to the bus. The USB defines the allowable maximum bulk data payload sizes to be only 8, 16,
32, or 64 bytes for full-speed endpoints and 512 bytes for high-speed endpoints. A low-speed device must
not have bulk endpoints. This maximum applies to the data payloads of the data packets; i.e., the size
specified is for the data field of the packet as defined in Chapter 8, not including other protocol-required
information.
So the max sector size is 512 bytes.
Regards, Steve.
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