Product comparison · 2 optical disc drives

NEC ND-4571 DVD RW Black vs NEC ND-7550 DVD-RW Black Slim

Key differences

Differences highlightedShow differences only

Comparison of ND-4571 DVD RW Black, ND-7550 DVD-RW Black Slim
42 specifications	A NEC ND-4571 DVD RW Black View product	B NEC ND-7550 DVD-RW Black Slim View product
Performanceidentical
Drive device, buffer sizeKnown for one	2 MB	Unknown — not stated by the source
Writing speed8 differ
CD write speedDiffers	48x	24x
CD rewrite speedDiffers	32x	20x
CD-R write speedDiffers	48x	24x
CD-RW write speedDiffers	32x	20x
DVD+R write speedDiffers	16x	8x
DVD-R Double Layer write speedKnown for one	Unknown — not stated by the source	4x
DVD-R write speedDiffers	16x	8x
DVD-RW write speedDiffers	8x	6x
DVD write speedDiffers	16x	8x
Reading speed8 differ
CD read speedDiffers	48x	24x
CD-R read speedDiffers	48x	24x
CD-RW read speedDiffers	32x	20x
DVD+R read speedDiffers	16x	8x
DVD-R Double Layer read speedDiffers	8x	4x
DVD-R read speedDiffers	16x	8x
DVD-RW read speedDiffers	8x	6x
DVD read speedDiffers	16x	8x
Access time1 differ
Access timeDiffers	140 ms	130 ms
Weight & dimensions1 differ
WeightDiffers	900 g	190 g
Other features4 differ
Dimensions (WxDxH)Differs	148 x 42 x 190 mm	128 x 12.7 x 129 mm
DVD+R speedDiffers	16x	8x
DVD-R speedDiffers	16x	8x
Double Layer DVD write speedDiffers	8x	4x
Technical featuresKnown for one	Unknown — not stated by the source	-12 cm / 8 cm CD & DVD -buffer underrun prevention

A dash means the value is not stated by the source. Unknown values are never counted for or against a product, and there is no overall score.