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I think that Western Digital is selling a RAID 1 USB/eSATA external drive and there are also other companies that have these ( terrastation, and Lacie probably )<br />
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eSATA would be MUCH faster<br />
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I hope this helps !
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Is there anyway to config a raid solution with 4 external USB drives? Is there like a raid 5 USB hub of sorts? or something along those lines... I am curious about a PC and MAC solution. <br />
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regards
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Is there anyway to config a raid solution with 4 external USB drives? Is there like a raid 5 USB hub of sorts? or something along those lines... I am curious about a PC and MAC solution. 

regards

External USB hard drive RAID solution

Computer data storage, often called storage or memory, is a technology consisting of computer components and recording media used to retain digital data. In addition to local storage devices like CD and DVD readers, hard drives and flash drives, solid state drives can hold enormous amounts of data in a very small device. Cloud services and other new forms of remote storage also add to the capacity of devices and their ability to access more data without building additional data storage into a device.

Storage

Mac OS X is the desktop operating system from Apple Inc., found on Macintosh computers. OS X consists of a Mach/BSD-based kernel, operating system interfaces primarily based on FreeBSD and additional frameworks (written in C, C++ and Objective-C providing user interface and application-level services.

Mac OS X

Storage devices include any device used for storing and retrieving digital information. Hard disk drives (HDDs) use one or more rigid ("hard") rapidly rotating disks (platters) coated with magnetic material. Data is accessed in a random-access manner, meaning that individual blocks of data can be stored or retrieved in any order and not only sequentially. The primary competing technology for secondary storage is flash memory in the form of solid-state drives (SSDs), but HDDs remain the dominant medium for secondary storage due to advantages in price per bit and per-device recording capacity. CD-RW (Compact Disc-ReWritable) is a digital optical disc storage format that allows information to be stored outside the mechanical HDD.