how many heads, Cylinders on a Quantum 540?

From: Richard Erlacher <>
Date: Fri Dec 31 18:11:30 1999

Yes, Don, that's what I've thought up to now as it agrees with my
literature, but if Allison says she has a 1005 that works with an ST506
drive, ... well ... she's got what she's got. I have one setup with a
1007V-SE and another with a 1007-WA2. The former is a bit fancier but
mainly there's a performance difference directly attributable to the
on-board hardware.

Happy New Year!


-----Original Message-----
From: Don Maslin <>
To: Discussion re-collecting of classic computers
Date: Friday, December 31, 1999 3:33 PM
Subject: Re: how many heads, Cylinders on a Quantum 540?

>On Fri, 31 Dec 1999, Richard Erlacher wrote:
>> GAWD! That's really a confusing mess! I always thought WD got its
>> board-level products badly mixed up number-wise, but this is beyond what
>> feared.
>> I have two flavors of 1007, which are definitely ESDI, only one 1006,
>> it's the MFM version, no EPROM, but I did at one time have a 1005 which
>> definitely for ESDI and a 1006 which had the RLL chips (5xxx-series) and
>> turned the MFM drive into an RLL easily enough.
>Reviewing the listing from TheRef, I find that the HDCs divide like
>this: 1001, 1002, 1003, 1004, and 1006 are all ST412 interface
> 1005, 1007, and 1009 are all ESDI interface.
>Within the ST412 grouping are both MFM and RLL controllers. There is
>only one version of the 1005, but multiple versions of the 1007 and
>Note that I delimited the above to HDCs to avoid addressing the 1002-FOX
> - don
>> ...and I thought the bridge controller boards were badly numbered!
>> Dick
>> -----Original Message-----
>> From: Allison J Parent <>
>> To: Discussion re-collecting of classic computers
>> <>
>> Date: Friday, December 31, 1999 10:07 AM
>> Subject: Re: how many heads, Cylinders on a Quantum 540?
>> ><No offense, Allison, but the 1007 and 1005 controllers won't work with
>> ><drive at all, as both 1005 and 1007 are ESDI controllers. You may be
>> ><thinking of the 1006's which come in both MFM and RLL. The 1006 WITH
>> ><EPROM on it is the RLL version, while the MFM version uses the
>> ><motherboard-resident BIOS to handle the HDD.
>> >
>> >I could be off on the 1007 though I have NO edsi drives and am using
>> >and WD1007 (least that what the markings are) and both are PC using
>> >Also my 1006 was used with them in the current system before I went IDE.
>> >Note we may be talking across part numbers as I have three 1005s that
>> >are each decidedly different from each other yet, the primary part of
>> >part number is WD1005! I also have 4 flavors of 1002, three differnt
>> >lengths, one surface mount! Of all the PC controllers from WDC I have
>> >about ten, starting with the 1002 also the 1003, 1005, 1006 and 1007.
>> >The only EDSI controller I have is a non WD design and I don't ahve
>> >for that.
>> >
>> ><ESDI is a high-level interface not at all like the "ultra-dumb"
>> ><ST-506/ST-412 interface this drive claims to have, though it does use
>> cable
>> ><of similar configuration, hence has similar connectors.
>> >
>> >Ah, I do know the difference.
>> >
>> ><This drive is commonly used with MFM, though its speed control, etc, is
>> ><capable of RLL densities as are most "MFM" drives.
>> >
>> >I've found it to be more successful than others though RD53s (micropolus
>> >1325s 71mb) were really nice at 100mb RLL and pretty reliable till they
>> >old.
>> >
>> >Allison
>> >
Received on Fri Dec 31 1999 - 18:11:30 GMT

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