Product comparison · 2 external hard drives

iStorage 3.5" Eco Drive 750GB vs iStorage SonicSTOR eSATA & USB 2.0 320GB

Key differences

HDD capacity
- 3.5" Eco Drive 750GB:750 GB
- SonicSTOR eSATA & USB 2.0 320GB:320 GB
Storage drive buffer size
- 3.5" Eco Drive 750GB:16 MB
- SonicSTOR eSATA & USB 2.0 320GB:8 MB
Width
- 3.5" Eco Drive 750GB:196 mm
- SonicSTOR eSATA & USB 2.0 320GB:38 mm
Depth
- 3.5" Eco Drive 750GB:32 mm
- SonicSTOR eSATA & USB 2.0 320GB:198 mm
Height
- 3.5" Eco Drive 750GB:127 mm
- SonicSTOR eSATA & USB 2.0 320GB:119 mm

Differences highlightedShow differences only

Comparison of 3.5" Eco Drive 750GB, SonicSTOR eSATA & USB 2.0 320GB
23 specifications	A iStorage 3.5" Eco Drive 750GB View product	B iStorage SonicSTOR eSATA & USB 2.0 320GB View product
Hard drive2 differ
HDD capacityDiffers	750 GB	320 GB
HDD speed	7200 RPM	7200 RPM
HDD sizeKnown for one	3.5"	Unknown — not stated by the source
Type	HDD	HDD
Storage drive average seek time	9 ms	9 ms
Storage drive buffer sizeDiffers	16 MB	8 MB
Ports & interfacesidentical
USB connectorKnown for one	USB	Unknown — not stated by the source
USB versionKnown for one	2.0	Unknown — not stated by the source
eSATAKnown for one	Unknown — not stated by the source	Yes
Weight & dimensions3 differ
WidthDiffers	196 mm	38 mm
DepthDiffers	32 mm	198 mm
HeightDiffers	127 mm	119 mm
WeightKnown for one	900 g	Unknown — not stated by the source
Packaging dataidentical
User guide	Yes	Yes
Other features1 differ
Internal	No	No
Mac compatibility	Yes	Yes
Mean time between failures (MTBF)	750000 h	750000 h
USB cable	USB	USB
Compatible operating systemsDiffers	- Windows 98 - Windows 98SE - Windows ME - Windows 2000 - Windows XP - Windows Vista - Mac OS X +	Windows 98/98SE/ME/2000/XP/Vista & Mac OS 10.2 +
Sustained data rateKnown for one	25 MB/s	Unknown — not stated by the source
Supported data transfer ratesKnown for one	Unknown — not stated by the source	700-800MB/min (USB 2.0), 1.5Gb/s (SATA), 3.0 Gb/s (SATA2)
USB 2.0 ports quantityKnown for one	Unknown — not stated by the source	1
eSATA cableKnown 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.