Reading ESDI disks

Nigel Johnson nw.johnson at
Thu Feb 11 12:05:04 CST 2021

I'm talking about the DEC Q-BUS DSA world where there never was any ATA :-)

Amateur Radio, the origin of the open-source concept!
Skype:  TILBURY2591 nw.johnson at

On 2021-02-11 1:03 p.m., Chuck Guzis via cctalk wrote:
> On 2/11/21 9:40 AM, Nigel Johnson via cctalk wrote:
>> Doesn't ATA transfer the data in parallel?  ESDI uses the same two
>> connectors as MFM (20/36 IIRC) , and transfers the data serially.  The
>> difference between MFM and ESDI is that MFM transfers the raw analogue
>> data over the cable but ESDI transfers digital serial data.
> I was speaking about the interface to the controller.  Of course, if you
> don't have the right controller, all bets are off.
> --Chuck

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