Product comparison · 2 internal hard drives

Seagate Exos M vs Seagate Constellation ST91000642SS-RF internal hard drive

17specifications compared
14differ
3identical
24known for one product only

Key differences

The Seagate Exos M has 27 TB more HDD capacity than the Seagate Constellation ST91000642SS-RF internal hard drive (28 TB vs 1 TB). The Seagate Exos M has 1" more HDD size than the Seagate Constellation ST91000642SS-RF internal hard drive (3.5" vs 2.5"). The Seagate Exos M has 448 MB more storage drive buffer size than the Seagate Constellation ST91000642SS-RF internal hard drive (512 MB vs 64 MB). Interface: Serial ATA on the Seagate Exos M, SAS on the Seagate Constellation ST91000642SS-RF internal hard drive. Operating voltage: 5 / 12 V on the Seagate Exos M, 5 V on the Seagate Constellation ST91000642SS-RF internal hard drive.

HDD capacity
- Exos M:28 TB
- Constellation ST91000642SS-RF internal hard drive:1 TB
HDD size
- Exos M:3.5"
- Constellation ST91000642SS-RF internal hard drive:2.5"
Interface
- Exos M:Serial ATA
- Constellation ST91000642SS-RF internal hard drive:SAS
Storage drive buffer size
- Exos M:512 MB
- Constellation ST91000642SS-RF internal hard drive:64 MB
Mean time between failures (MTBF)
- Exos M:2500000 h
- Constellation ST91000642SS-RF internal hard drive:1400000 h
Operating voltage
- Exos M:5 / 12 V
- Constellation ST91000642SS-RF internal hard drive:5 V
Operating temperature (T-T)
- Exos M:10 - 60 °C
- Constellation ST91000642SS-RF internal hard drive:5 - 60 °C
Non-operating vibration
- Exos M:2.27 G
- Constellation ST91000642SS-RF internal hard drive:3 G

Side by side

Differences highlightedShow differences only

Comparison of Exos M, ST91000642SS-RF
41 specifications	A Seagate Exos M View product	B Seagate Constellation ST91000642SS-RF internal hard drive Model ST91000642SS-RF View product
Features5 differ
HDD capacityDiffers	28 TB	1 TB
HDD speed	7200 RPM	7200 RPM
HDD sizeDiffers	3.5"	2.5"
InterfaceDiffers	Serial ATA	SAS
Type	HDD	HDD
Storage drive buffer sizeDiffers	512 MB	64 MB
HDD number of headsKnown for one	Unknown — not stated by the source	8
Read seek timeKnown for one	Unknown — not stated by the source	7.5 ms
Write seek timeKnown for one	Unknown — not stated by the source	8.5 ms
Average latency	4.16 ms	4.16 ms
Bytes per sectorKnown for one	Unknown — not stated by the source	512
RefurbishedKnown for one	Unknown — not stated by the source	Yes
Mean time between failures (MTBF)Differs	2500000 h	1400000 h
Component forKnown for one	Server/workstation	Unknown — not stated by the source
Hot-swapKnown for one	Yes	Unknown — not stated by the source
HDD interface transfer rateKnown for one	12 Gbit/s	Unknown — not stated by the source
HDD sustained transfer rateKnown for one	257 MiB/s	Unknown — not stated by the source
HDD average transfer rateKnown for one	270 MB/s	Unknown — not stated by the source
Uncorrectable Bit Error Rate (UBER)Known for one	< 1 per 10^15 bits read	Unknown — not stated by the source
Power1 differ
Power consumption (typical)Known for one	Unknown — not stated by the source	6.35 W
Operating voltageDiffers	5 / 12 V	5 V
Start-up currentKnown for one	Unknown — not stated by the source	2 A
Power consumption (idle)Known for one	6.9 W	Unknown — not stated by the source
Operational conditions4 differ
Operating temperature (T-T)Differs	10 - 60 °C	5 - 60 °C
Storage temperature (T-T)Known for one	Unknown — not stated by the source	-40 - 70 °C
Operating relative humidity (H-H)Known for one	Unknown — not stated by the source	5 - 95%
Storage relative humidity (H-H)Known for one	Unknown — not stated by the source	5 - 95%
Operating vibrationKnown for one	Unknown — not stated by the source	0.5 G
Non-operating vibrationDiffers	2.27 G	3 G
Operating altitudeKnown for one	Unknown — not stated by the source	-60.96 - 3048 m
Non-operating altitudeKnown for one	Unknown — not stated by the source	-60.96 - 12192 m
Operating shockDiffers	30 G	70 G
Non-operating shockDiffers	200 G	400 G
Weight & dimensions4 differ
WidthDiffers	101.8 mm	69.8 mm
DepthDiffers	147 mm	100 mm
HeightDiffers	26.1 mm	15 mm
WeightDiffers	695 g	200 g
Other featuresidentical
Data transfer rateKnown for one	Unknown — not stated by the source	4.69 Gbit/s
InternalKnown for one	Unknown — not stated by the source	Yes
Plug and PlayKnown for one	Unknown — not stated by the source	Yes
Warranty periodKnown for one	5 year(s)	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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