Product comparison · 2 optical disc drives

NEC AD-7170A DVD-RW 18x vs NEC AD-7633 black

20specifications compared
11differ
9identical
10known for one product only

Key differences

CD write speed
- AD-7170A DVD-RW 18x:48x
- AD-7633 black:24x
CD rewrite speed
- AD-7170A DVD-RW 18x:32x
- AD-7633 black:16x
DVD+R write speed
- AD-7170A DVD-RW 18x:18x
- AD-7633 black:8x
DVD-R Double Layer write speed
- AD-7170A DVD-RW 18x:8x
- AD-7633 black:4x
DVD-R write speed
- AD-7170A DVD-RW 18x:18x
- AD-7633 black:8x
DVD-RAM write speed
- AD-7170A DVD-RW 18x:12x
- AD-7633 black:5x
CD read speed
- AD-7170A DVD-RW 18x:48x
- AD-7633 black:24x
DVD read speed
- AD-7170A DVD-RW 18x:16x
- AD-7633 black:8x

Side by side

Differences highlightedShow differences only

Comparison of AD-7170A DVD-RW 18x, AD-7633 black
30 specifications	A NEC AD-7170A DVD-RW 18x View product	B NEC AD-7633 black View product
Designidentical
Internal	Yes	Yes
Product colour	Black	Black
Disc loading typeKnown for one	Tray	Unknown — not stated by the source
Performanceidentical
Interface	EIDE/ATA	EIDE/ATA
Drive device, buffer sizeKnown for one	Unknown — not stated by the source	2 MB
Writing speed6 differ
CD write speedDiffers	48x	24x
CD rewrite speedDiffers	32x	16x
DVD+R write speedDiffers	18x	8x
DVD+RW write speed	8x	8x
DVD-R Double Layer write speedDiffers	8x	4x
DVD-R write speedDiffers	18x	8x
DVD-RAM write speedDiffers	12x	5x
DVD-RW write speed	6x	6x
DVD+R Double Layer write speedKnown for one	Unknown — not stated by the source	4x
Reading speed2 differ
CD read speedDiffers	48x	24x
DVD read speedDiffers	16x	8x
Access time1 differ
DVD drive average random access timeDiffers	160 ms	190 ms
Access timeKnown for one	140 ms	Unknown — not stated by the source
CD-ROM drive average random access timeKnown for one	Unknown — not stated by the source	190 ms
Record modesidentical
Disc-at-once (DAO)	Yes	Yes
Fixed packetKnown for one	Yes	Unknown — not stated by the source
Multi session	Yes	Yes
Session-at-once (SAO)	Yes	Yes
Track-at-once (TAO)	Yes	Yes
Variable packetKnown for one	Yes	Unknown — not stated by the source
Weight & dimensions1 differ
WeightDiffers	705 g	160 g
Other features1 differ
Media types supportedKnown for one	DVD-ROM, DVD-Video, CD-ROM, CD-ROM XA, CD-I Ready, CD-Bridge, PhotoCD, VideoCD, CD-DA, CD Extra, CD Text	Unknown — not stated by the source
Dimensions (WxDxH)Differs	148 x 175 x 42 mm	12.7 x 128 x 129 mm
Drive devices burst data transfer rate (PIO)Known for one	mode 4	Unknown — not stated by the source
Drive devices burst data transfer rate (Ultra DMA)Known for one	Ultra DMA 66	Unknown — not stated by the source

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.

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