Product comparison · 2 internal hard drives

Seagate 500GB Constellation ES SAS HDD vs Seagate LD25.2 40GB

18specifications compared
15differ
3identical
20known for one product only

Key differences

HDD capacity
- 500GB Constellation ES SAS HDD:500 GB
- LD25.2 40GB:40 GB
HDD speed
- 500GB Constellation ES SAS HDD:7200 RPM
- LD25.2 40GB:5400 RPM
HDD size
- 500GB Constellation ES SAS HDD:3.5"
- LD25.2 40GB:2.5"
Storage drive buffer size
- 500GB Constellation ES SAS HDD:16 MB
- LD25.2 40GB:2 MB
Read seek time
- 500GB Constellation ES SAS HDD:8.5 ms
- LD25.2 40GB:14 ms
Write seek time
- 500GB Constellation ES SAS HDD:9.5 ms
- LD25.2 40GB:15 ms
Average latency
- 500GB Constellation ES SAS HDD:4.16 ms
- LD25.2 40GB:5.6 ms
Operating voltage
- 500GB Constellation ES SAS HDD:5 / 12 V
- LD25.2 40GB:5 V

Side by side

Differences highlightedShow differences only

Comparison of 500GB Constellation ES SAS HDD, LD25.2 40GB
38 specifications	A Seagate 500GB Constellation ES SAS HDD View product	B Seagate LD25.2 40GB View product
Features7 differ
HDD capacityDiffers	500 GB	40 GB
HDD speedDiffers	7200 RPM	5400 RPM
HDD sizeDiffers	3.5"	2.5"
Storage drive buffer sizeDiffers	16 MB	2 MB
Read seek timeDiffers	8.5 ms	14 ms
Write seek timeDiffers	9.5 ms	15 ms
Track to track seek timeKnown for one	0.5 ms	Unknown — not stated by the source
Average latencyDiffers	4.16 ms	5.6 ms
Bytes per sector	512	512
Mean time between failures (MTBF)Known for one	1200000 h	Unknown — not stated by the source
InterfaceKnown for one	Unknown — not stated by the source	Serial ATA
HDD number of headsKnown for one	Unknown — not stated by the source	1
Power2 differ
Power consumption (typical)Known for one	10.4 W	Unknown — not stated by the source
Operating voltageDiffers	5 / 12 V	5 V
Start-up currentDiffers	1.89 A	1.1 A
Operational conditions1 differ
Operating temperature (T-T)Differs	5 - 60 °C	0 - 60 °C
Storage temperature (T-T)	-40 - 70 °C	-40 - 70 °C
Operating shockKnown for one	Unknown — not stated by the source	175 G
Non-operating shockKnown for one	Unknown — not stated by the source	500 G
Weight & dimensions4 differ
WidthDiffers	101.6 mm	70.1 mm
DepthDiffers	147 mm	100.5 mm
HeightDiffers	26.1 mm	9.7 mm
WeightDiffers	610 g	100 g
Other features1 differ
Ethernet LANKnown for one	No	Unknown — not stated by the source
Data transfer rateDiffers	6 Gbit/s	1.5 Gbit/s
Fibre ChannelKnown for one	No	Unknown — not stated by the source
FireWire 400Known for one	No	Unknown — not stated by the source
FireWire 800Known for one	No	Unknown — not stated by the source
Internal	Yes	Yes
USB 2.0 ports quantityKnown for one	0	Unknown — not stated by the source
USB 3.2 Gen 1 (3.1 Gen 1) ports quantityKnown for one	0	Unknown — not stated by the source
USB poweredKnown for one	No	Unknown — not stated by the source
eSATAKnown for one	No	Unknown — not stated by the source
Sustained data rateKnown for one	150 MB/s	Unknown — not stated by the source
Acoustic pressure emissionsKnown for one	1.9 dB	Unknown — not stated by the source
Disks included quantityKnown for one	Unknown — not stated by the source	1 pc(s)
Dimensions (W x D x H) (imperial)Known for one	Unknown — not stated by the source	70.1 x 100.5 x 9.7 mm (2.76 x 3.96 x 0.382")
Weight (imperial)Known for one	Unknown — not stated by the source	0.0998 kg (0.22 lbs)

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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