will this work in either a acer m3470g-uw10p or a compaq T2885?

The acer can definitely use this drive. Looked up that compaq model number and it looks to be an older computer, I really doubt that unit has SATA ports. So definitely on the acer, would say no to the compaq. Hope this helps :)

Would this HD unit replace a 20 GB HD in a Compaq Evo d500 SFF, model 0786h, Intel Chipset i845, and Intel Pentium 4 Williamette1.50 GHz?

Yes, this drive can be used anywhere you have IDE drives. IDE drives use wide, flat, grey cables. The drive will have to be partishioned and formated. I use a Windows XP install CD that automaticly does that.

Will this drive work with a thinkpad r51e computer?

I feel confident in saying these days most laptops do not use these 3.5" drives.

it had a maxtor n256 3.5 series 40GB fireball can I upgrade to this diver?

Wow! You're going retro with me haha. The answer is that unfortunately it won't be compatible if my recollection is correct. See what others think then come up with your own conclusion.

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Western Digital Blue WD800BB 80GB 7200 RPM 2MB Cache IDE Ultra ATA100 / ATA-6 3.5" Hard Drive Bare Drive

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7200 RPM 2MB Cache
IDE Ultra ATA100 / ATA-6
90 days limited

🔥Don't forget your OS, we have Windows 11 OEM, Download and USB versions available

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WD Caviar Blue hard drives boast a multitude of available features to deliver rock solid performance and ultra-cool and quiet operation, which is perfect for family and business computing.

Western Digital Caviar Blue 80Gb 7200Rpm 2Mb Buffer Ata/Ide Hard Disk Drive. 40Pin 3.5Inch Form Factor

IDE Ultra ATA 100/ ATA-6 InterfaceThe IDE Ultra ATA 100/ ATA-6 interface provides up to 100 MB/s throughput for fast data transfer.
Fluid Dynamic Bearing (FDB) technologyFluid Dynamic Bearing (FDB) technology minimizes noise and vibration for ultra-quiet operation and efficiently reduces friction and heat for supreme hard drive reliability.
High Performance7200 RPM drive complements the high capacity delivering a power combination of extreme storage and top-end desktop performance.

Model
Brand	Western Digital
Series	Blue
Model	WD800BB
Packaging	Bare Drive

Performance
Interface	IDE Ultra ATA100 / ATA-6
Capacity	80GB
RPM	7200 RPM
Cache	2MB
Average Seek Time	8.9ms

Features
Features	Quiet - Fluid Dynamic Bearing (FDB) technology - Less friction means more reliability; less heat, vibration, and noise.

Dimensions
Form Factor	3.5"

Additional Information
First Listed on Newegg	August 12, 2008

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Limited Warranty period (parts): 90 days
Limited Warranty period (labor): 90 days
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Return for refund within: 30 days

Return for replacement within: 30 days

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Manufacturer Contact Info

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Support Phone: 1-800-275-4932
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Western Digital Blue WD800BB 80GB 7200 RPM 2MB Cache IDE Ultra ATA100 / ATA-6 3.5" Hard Drive Bare Drive

Refurbished

Learn more about the Western Digital WD800BB

Customer Reviews of the Western Digital WD800BB

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info

Item#: N82E16822136292

Western Digital Blue WD800BB 80GB 7200 RPM 2MB Cache IDE Ultra ATA100 / ATA-6 3.5" Hard Drive Bare Drive

Refurbished

Learn more about the Western Digital WD800BB

Customer Reviews of the Western Digital WD800BB

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info