Category Archives: IDE

Vague Standards are Trouble

Through the course of time I’ve been going over the IDENTIFY data of various old IDE hard disks. Today I happened to come across a Conner CP30254H drive, apparently made in June 1993 or so. This is a circa 250 … Continue reading

Posted in Conner, IBM, IDE, PC history | 2 Comments

Another Trip to Drive Geometry Hell

Recently I took another close look at the IDE.DSK driver in NetWare 3.12. Among other things, I wanted to know how it differs from ISADISK.DSK. On some systems, the two drivers are interchangeable and either will work. But there are … Continue reading

Posted in IDE, NetWare, PC history | 8 Comments

First Dual-Channel IDE?

The OS/2 Museum recently came into possession of what may be the first adapter with support for two IDE channels… sort of: The adapter was made by Plus Development Corporation, a subsidiary of the disk maker Quantum. This particular specimen … Continue reading

Posted in IDE, PC hardware, PC history, Quantum | 29 Comments

Deeper Into ATA History

While looking for something completely unrelated (namely the Rock Ridge extensions to ISO 9660), I came across a cache of old X3T9 committee documents from 1990. In retrospect I’m a little surprised that I hadn’t found these earlier, since the … Continue reading

Posted in IDE, PC history, Standards | 17 Comments

The Dual-Drive IDE Hell

I have perhaps inaccurate but very strong memories from my PC-building days (in the early to mid-1990s) that one of the most failure-prone and frustrating endeavors was trying to get two IDE drives working together on a single cable as … Continue reading

Posted in IDE, PC hardware, PC history | 19 Comments

IDENTIFY Ancient DRIVE

This article will attempt to collect IDENTIFY DRIVE dumps from antique IDE drives, with running commentary. For the purposes of this list, “antique” is defined as a drive model released in 1990 or earlier, typically with the drive itself also … Continue reading

Posted in IDE, PC hardware, PC history, Storage | 9 Comments

Learn Something Old Every Day, Part II

The ultimate reason why I pulled out the old Seagate ST-225 drive was because I wanted to try connecting it to the Western Digital WD1003-IWH board that I recently acquired. The WD1003-IWH is a curious evolutionary half-step between ST506 interface … Continue reading

Posted in IDE, PC hardware, PC history, Storage | 10 Comments

Recalibration Needed

The OS/2 Museum recently acquired two horribly slow old Western Digital IDE drives model WD93044-A. These were WD’s first foray into IDE hard disks, combining a rather outdated Tandon RLL drive chassis (3.5″ half-height stepper drives) with WD’s own controller … Continue reading

Posted in Bugs, IDE, Western Digital | 32 Comments

Whence IDENTIFY DRIVE?

As most everyone knows, the AT Attachment standard (informally known as IDE) started by literally bolting the previously standalone AT disk controller onto a MFM drive with a ST506 interface and connecting the assembly to the host system with a … Continue reading

Posted in Compaq, Documentation, IDE, PC hardware, PC history, Storage | 33 Comments

Reading From Void

Recently I came across the following question: What happens when software reads the registers of a non-existent IDE controller? That is, what happens when software reads for example ports in the 1F0h-1F7h/3F6h range (primary IDE channel) when there is no … Continue reading

Posted in BIOS, IDE, PC hardware | 10 Comments