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Hardware :: Can External Hard Drives Be Daisy Chained Through USB

I have two hard drive enclosures: a Macally G-S350SUA, which has Firewire, eSATA, and USB 2.0; and an older Ximeta enclosure which is only USB, which I haven't been using. I have been using the Macally recently but I want to set up a second external hard drive so that I can use the Macally for data. Is it possible to daisy chain two external hard drives through USB, or only through Firewire? The USB plugs on both enclosures are Type B female, so I suppose I'd need a B/B USB cable, which I don't have, so I haven't tried it yet...

View 1 Replies (Posted: Dec 28, 2010)

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I'm running two of these enclosures: [URL] each with 2x2TB drives in RAID0 (i.e. 4TB per enclosure). I use one 4TB array for my user files, and the other for TimeMachine. My user array is connected via FW800, my question is - is it more efficient to connect the other (TM) array via USB2 or via daisy chained FW800? The enclosures use the Oxford 934DSb chipset, which is capable of saturating the FW bus, so thats 100MBps. As i understand it very few interfaces are capable of saturating a USB2 bus such that practically speaking even FW400 gives greater real-world throughput than USB2, despite the 60Mbps difference in spec.

Since one is a TM volume, when backing up from the user array to the TM array will the data have to pass through the computer's controller? It definitely will if it's FW800 -> USB2, but will it have to if it's daisy chained FW800? I'm told this might not be the case as some FW controllers support P2P communication but i can't find too much info about it. Even if there is P2P support the OS needs to know the progress of file transfers and so forth so can it do this even if the drives are transferring via P2P or can it only monitor that sort of thing if the data goes through it's controller? Essentially is it up to the OS or the controller to select the optimal route for data? If it's up to the OS does Mac OS support FW P2P? That said, even if the data does have to go to the computer from one array and back through the daisy chain to the other array, is it still practically faster than the USB2 route?

Posted: Aug 23, 2010

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OS X :: Best External Hard Drives For Macs?
i am very interested in buying a Mac. But I need an external hard drive for my stuff. What are the best 1TB or higher external hard drives for a Mac Book Pro?

Posted: Jan 11, 2011

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OS X :: New External Hard Drives Crashing
I often use external hard drives to back up my work. Recently I purchased a 1TB Lacie drive. I took a week to build a lovely new file structure for my work. At the end of this week, I began deleting the old files on other hard drives so as to transfer my new neatly structured work back on. In the midst of this, the brand new hard drive crashed, illiciting only the clicking sound of death.

That hard drive, some of my work (a very small amount but still) and a week's worth of sweat and blood was gone in an instant. The person I took it to to look at it mentioned a power surge as being a possible cause for the crash. Anyway, I returned the lacie and bought a 1T Western Digital Mybook (silver). I then began dumping the old back ups onto this.

A week in and this one is crashed too. No clicking sound of death. It calmly sits on my desk with it's unceasing unblinking blue light and refuses to show up in utilities no matter what I do. So I assume it's a goner also. I'll return it also of course. Is something causing these drives to fail...that exists in my walls? Are there power surges causing my drives to die...? OR is it simply a case of bad luck with my choices of new drives?

Posted: Feb 25, 2009

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