bastian915
wanting to get an external hard drive for my laptop....looking at different manufactures and wondering if at a fairly good bus speed like in the Firewire 400 connection if there really would be much difference between 5400rpm and 7200rpm. I'm just wondering because the portable bus powered hard drives seem to come with 5400rpm and the desktop versions can go a bit faster.
Hey wizard of OZ thanks for the post....wondering if it would then be worthwhile (since the laptop only has firewire 400) to get a firewire 800 express card for the faster bus speed.
Answer
To start with the drives in external hard drives are the same as you have in a desktop. The difference between 5400rpm and 7200rpm is that the faster you turn the disk platters the faster you get to the data and reduce something called rotational delay which can be most the the time to retrieve data from a drive or write to it. The reason the bus powered drives are slower is that the slower drives take less power. Any external drive is going to be slower than an internal drive because even Firewire is not as fast as an internal bus connnection.
Bottom line it probably does not matter which you get because you should only be using an external drive for backup or moving data via sneaker net. I would suggest that the faster bus is your best bet though.
To start with the drives in external hard drives are the same as you have in a desktop. The difference between 5400rpm and 7200rpm is that the faster you turn the disk platters the faster you get to the data and reduce something called rotational delay which can be most the the time to retrieve data from a drive or write to it. The reason the bus powered drives are slower is that the slower drives take less power. Any external drive is going to be slower than an internal drive because even Firewire is not as fast as an internal bus connnection.
Bottom line it probably does not matter which you get because you should only be using an external drive for backup or moving data via sneaker net. I would suggest that the faster bus is your best bet though.
External Hard drive help?
Elizabeth
I need to purchase an external hard drive and am lost at where to start..
I'll be using it for my photography...at the moment I'm in college so I would say I don't need a professional level of space but something that has a large amount.
thanks! :)
Also please be specific and detailed. I'd love to learn about what Im buying...
Answer
It's hard to recommend a specific model, but one key choice is:
Desktop or portable?
A Desktop drive has a power supply (only ever seen them with external plugtop ones) and is typically cheaper for a particular capacity.
A portable drive has no power supply, and generally requires two USB ports to provide power, both ports must be capable of supplying full USB power, so an unpowered hub is no use, the ports must be on a powered hub or direct from the PC.
For higher performance, if using with a system that has an ESATA port, some drives alos support the faster ESATA connection, as well as the common USB.
USB 2.0 is quite fast, but USB 3.0 is beginning to appear... it should operate at faster transfer speeds (as fast as internal drives or ESATA) where a USB 3.0 drive is connected to USB 3.0, and at USB2 speeds when only one side is USB3.
Other than some very low capacity ones (I've seen 80GB), 320GB is about the lowest capacity commonly seen, and if you had a 16GB memory card in your camera, that would be enough to dump a full card 20 times.
Capacities up to 2TB (2000GB) or even 3TB can be found.
For desktop drives, the "sweet spot" of price vs capacity is usually the 1TB or 2TB models, anything smaller doesn't save that much on the price. Portable drives seen be more around the 500GB mark
Alternatively, you can get a 64GB Flash drive for $54.25 (cheapest one at newegg) - while nothing like the capacity of a hard drive, drop a hard drive and it's probably dead, drop a flash drive and it'll probably still work, much better as a carry around.
It's hard to recommend a specific model, but one key choice is:
Desktop or portable?
A Desktop drive has a power supply (only ever seen them with external plugtop ones) and is typically cheaper for a particular capacity.
A portable drive has no power supply, and generally requires two USB ports to provide power, both ports must be capable of supplying full USB power, so an unpowered hub is no use, the ports must be on a powered hub or direct from the PC.
For higher performance, if using with a system that has an ESATA port, some drives alos support the faster ESATA connection, as well as the common USB.
USB 2.0 is quite fast, but USB 3.0 is beginning to appear... it should operate at faster transfer speeds (as fast as internal drives or ESATA) where a USB 3.0 drive is connected to USB 3.0, and at USB2 speeds when only one side is USB3.
Other than some very low capacity ones (I've seen 80GB), 320GB is about the lowest capacity commonly seen, and if you had a 16GB memory card in your camera, that would be enough to dump a full card 20 times.
Capacities up to 2TB (2000GB) or even 3TB can be found.
For desktop drives, the "sweet spot" of price vs capacity is usually the 1TB or 2TB models, anything smaller doesn't save that much on the price. Portable drives seen be more around the 500GB mark
Alternatively, you can get a 64GB Flash drive for $54.25 (cheapest one at newegg) - while nothing like the capacity of a hard drive, drop a hard drive and it's probably dead, drop a flash drive and it'll probably still work, much better as a carry around.
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Title Post: external hard drives.....rpm speed vs bus speed?
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