Product comparison · 2 internal solid state drives

Dynabook RD400 256 GB M.2 PCI Express 3.1 NVMe MLC vs Dynabook RD400A 128 GB M.2 PCI Express 3.1 NVMe MLC

32specifications compared
12differ
20identical
3known for one product only

Key differences

SSD capacity
- RD400 256 GB M.2 PCI Express 3.1 NVMe MLC:256 GB
- RD400A 128 GB M.2 PCI Express 3.1 NVMe MLC:128 GB
Component for
- RD400 256 GB M.2 PCI Express 3.1 NVMe MLC:PC/Laptop
- RD400A 128 GB M.2 PCI Express 3.1 NVMe MLC:PC
Read speed
- RD400 256 GB M.2 PCI Express 3.1 NVMe MLC:2600 MB/s
- RD400A 128 GB M.2 PCI Express 3.1 NVMe MLC:2200 MB/s
Write speed
- RD400 256 GB M.2 PCI Express 3.1 NVMe MLC:1150 MB/s
- RD400A 128 GB M.2 PCI Express 3.1 NVMe MLC:620 MB/s
Endurance rating (for 5 years)
- RD400 256 GB M.2 PCI Express 3.1 NVMe MLC:81 GB/day
- RD400A 128 GB M.2 PCI Express 3.1 NVMe MLC:40 GB/day
TBW rating
- RD400 256 GB M.2 PCI Express 3.1 NVMe MLC:148
- RD400A 128 GB M.2 PCI Express 3.1 NVMe MLC:74
Operating voltage
- RD400 256 GB M.2 PCI Express 3.1 NVMe MLC:3.3 V
- RD400A 128 GB M.2 PCI Express 3.1 NVMe MLC:12 V
Power consumption (average)
- RD400 256 GB M.2 PCI Express 3.1 NVMe MLC:6 W
- RD400A 128 GB M.2 PCI Express 3.1 NVMe MLC:6.4 W

Side by side

Differences highlightedShow differences only

Comparison of RD400, RD400A
35 specifications	A Dynabook RD400 256 GB M.2 PCI Express 3.1 NVMe MLC Model RD400 View product	B Dynabook RD400A 128 GB M.2 PCI Express 3.1 NVMe MLC Model RD400A View product
Features6 differ
SSD capacityDiffers	256 GB	128 GB
SSD form factor	M.2	M.2
Interface	PCI Express 3.1	PCI Express 3.1
NVMe	Yes	Yes
NVMe version	1.1b	1.1b
Memory type	MLC	MLC
Component forDiffers	PC/Laptop	PC
Data transfer rate	32 Gbit/s	32 Gbit/s
Read speedDiffers	2600 MB/s	2200 MB/s
Write speedDiffers	1150 MB/s	620 MB/s
Random read (4KB)Known for one	210000 IOPS	Unknown — not stated by the source
Random write (4KB)Known for one	140000 IOPS	Unknown — not stated by the source
PCI Express interface data lanes	x4	x4
S.M.A.R.T. support	Yes	Yes
TRIM support	Yes	Yes
Mean time between failures (MTBF)	1500000 h	1500000 h
Windows operating systems supported	Windows 10, Windows 7, Windows 8.1	Windows 10, Windows 7, Windows 8.1
Linux operating systems supported	Yes	Yes
Endurance rating (for 5 years)Differs	81 GB/day	40 GB/day
TBW ratingDiffers	148	74
SSD usage tag	Consumer	Consumer
Certification	UL/cUL, FCC, CE, RCM, KC, BSMI, VCCI, ISED	UL/cUL, FCC, CE, RCM, KC, BSMI, VCCI, ISED
Power2 differ
Operating voltageDiffers	3.3 V	12 V
Power consumption (average)Differs	6 W	6.4 W
Weight & dimensions4 differ
WidthDiffers	22 mm	105.5 mm
DepthDiffers	80 mm	157.6 mm
HeightDiffers	2.23 mm	17.2 mm
WeightDiffers	7.2 g	63 g
Operational conditionsidentical
Operating temperature (T-T)	0 - 70 °C	0 - 70 °C
Storage temperature (T-T)	-40 - 85 °C	-40 - 85 °C
Operating vibration	2.17 G	2.17 G
Non-operating vibration	3.13 G	3.13 G
Non-operating shock	1000 G	1000 G
Logistics dataidentical
Harmonized System (HS) code	84717070	84717070
Packaging dataidentical
Storage drive adapter includedKnown for one	Unknown — not stated by the source	Yes

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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