Conclusion: Adding this drive nearly doubled the write speed of the Beige G3. It even outperformed a Yosemite G3/400 whose MacBench rating was 1090 (6 gig Fireball). It's a no brainer for any Mac user with the need for a larger, faster IDE drive.

• The test computer was a Beige G3 266 DT with a PowerLogix G3/466 ZIF upgrade and 128M of RAM.
• The original drive was a Quantum Fireball SE 4 gig. The replacement drive was a Maxtor Diamond Max Plus 20.4 gig UltraDMA/66 EIDE. (The Maxtor drive was purchased on special at CompUSA Honolulu for $199. There have been similar specials at Onsale, Costco, and Staples. Check with Deal-Mac.)
• I installed both drives as MASTER. If you want to keep both drives connected, one must be set up as a SLAVE. This only works if you have a REV 2 Beige G3. (See Accelerate Your Mac's upgrade instructions for IDE drives.)
• Before the tests were run, both drives were freshly formatted with HD Setup version 1.7 and Mac OS 8.6 was installed. The Maxtor was divided into two partitions: 4 gig and 16 gig. The tests were run in the 4 gig partition containing the System Folder.
• MacBench 5.0 attempts to simulate a mix of real world disk operations. The disk cache was set to 512K instead of the default setting to minimize effects of caching.
• FWB's Hard Disk Tookit has an excellent Bench Test module that can give accurate information on Sustained Read/Write, Random Read/Write, Transactions/Second, etc. (There's a special price of $35.95 if you go to the Special Order page and inter "6sum99" in the discount code field.)

A big THANK YOU to...

...David Tasaka of Lyte-On for the use of his Beige G3 DT for testing

...PowerLogix for the use of the G3/466 ZIF upgrade