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HP DVD840 Faster transfers than 940/640The DVD840 ('e' for external or 'i' for internal) is almost identical to the external 940'e' you refer too.

These units differ only slightly in their transfer speeds as the faster 840 models use CAV and Z-CLV.

The DVD940e is an external version of the DVD640 and has the same buffer sizes, USB and or IDE speeds of the similar 840 internal IDE and external USB models.

Comparision and view of Specs are available online at:

http://h10025.www1.hp.com/ewfrf/wc/document?docname=npg40846&cc=us&lc=en&dlc=en&product=1101461&dlc=en&lang=en

Data Sheets and Document manuals:

DVD840i - http://h10032.www1.hp.com/ctg/Manual/c00524200.pdf

DVD940 (640) - http://h20000.www2.hp.com/bc/docs/support/SupportManual/c00774530/c00774530.pdf?jumpid=reg_R1002_USEN

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Q: What is the difference between the HP DVD840 sold at Walmart and the HP DVD940e sold at Compusa?
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