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Subject: USB ICs (was: > 32 GB?)

USB ICs (was: > 32 GB?)

From: Uwe Freese <>
Date: Tue, 31 Dec 2002 13:59:33 +0100

Hello Sylvan,

Sylvan Butler wrote on Tuesday, December 31, 2002, 7:46:17 AM:

SB> The issue is that the previous version of the ATA spec defined a
SB> 28bit address to select logical blocks (the LBA). 2^28 blocks is
SB> 128GB (which rounds up to 13x gb when using powers of 10).

SB> The most recent version of the spec defines a 48bit address, but from
SB> what I've read, that isn't supported by the ISD chips.

AFAIK the ISD 300 does support ATA5, which is 2^28 Blocks = 128 GB (~ Byte). The successor, Cypress CY7C68300 (only some
months old), supports ATA6 with 2^48 Blocks. I've read somewhere that
Cypress Semiconductors overtook (bought) In-Design. They also sell the
ISD-chips now.

ISD-200 USB 1.1 max ~ 1.0 MB/s
ISD-300 USB 2.0 max ~14.5 MB/s
CY7C68300 USB 2.0 max ~28.0 MB/s

I bought an external harddrive box a month ago with this new Cypress
chip inside. It really *is* that fast. :-)

Bye, Uwe.
Received on 2002-12-31

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