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Multi-actuator hard drives from Seagate
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Multi-actuator hard drives from Seagate
Percival P. Cassidy wrote:
http://www.tomshardware.com/news/hdd...ate,36132.html Defragmenters will have to adopt new algorithms so they position sequential data not in successive clusters within the same track on the same platter but jigsawing the data across multiple platters. So one head can read one cluster of data while a head on the other arm can be reading the next logically sequential cluster of data in building up the data stream. So they split the arm into 2 arms to increase access speed. Still limited to just 2 heads at a time. Maybe they'll eventually use separate arms for each platter. I suspect the noise level will go up. Instead of one arm making chunking noise, now there will be 2, then 4, then 8, then 16. Wonder how much more the multi-arm drives will vibrate which will require more insulating to dampen the vibration transmitted to the cage and then to the case. |
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Multi-actuator hard drives from Seagate
On Tue, 19 Dec 2017 20:35:33 -0600, VanguardLH wrote:
Percival P. Cassidy wrote: http://www.tomshardware.com/news/hdd...ate,36132.html Defragmenters will have to adopt new algorithms so they position sequential data not in successive clusters within the same track on the same platter but jigsawing the data across multiple platters. So one head can read one cluster of data while a head on the other arm can be reading the next logically sequential cluster of data in building up the data stream. I didn't get that impression from the article. From the blog post: The host computer can treat a single Dual Actuator drive as if it were two separate drives. This means the host computer can ask a single high-capacity drive to retrieve two different data requests simultaneously — delivering data up to twice as fast compared with a single-actuator drive. /blog The host computer is expected to ask the drive to do two things at once, but I don't see that as expecting the drive to read interleaved data and assemble it on the fly. Instead, it sounds more like the following: read two files simultaneously write two files simultaneously write one file while reading another Besides, I'm not worried about defragging. That went out of fashion many years ago. |
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Multi-actuator hard drives from Seagate
Mark Perkins wrote:
On Tue, 19 Dec 2017 20:35:33 -0600, VanguardLH wrote: Percival P. Cassidy wrote: http://www.tomshardware.com/news/hdd...ate,36132.html Defragmenters will have to adopt new algorithms so they position sequential data not in successive clusters within the same track on the same platter but jigsawing the data across multiple platters. So one head can read one cluster of data while a head on the other arm can be reading the next logically sequential cluster of data in building up the data stream. I didn't get that impression from the article. From the blog post: The host computer can treat a single Dual Actuator drive as if it were two separate drives. This means the host computer can ask a single high-capacity drive to retrieve two different data requests simultaneously — delivering data up to twice as fast compared with a single-actuator drive. /blog The host computer is expected to ask the drive to do two things at once, but I don't see that as expecting the drive to read interleaved data and assemble it on the fly. Instead, it sounds more like the following: read two files simultaneously write two files simultaneously write one file while reading another Besides, I'm not worried about defragging. That went out of fashion many years ago. With your interpretation, there would be nothing faster about reading or writing *a* file. Not much point in wasting the money on this drive technology. |
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Multi-actuator hard drives from Seagate
On Tue, 19 Dec 2017 22:54:19 -0600, VanguardLH wrote:
Mark Perkins wrote: On Tue, 19 Dec 2017 20:35:33 -0600, VanguardLH wrote: Percival P. Cassidy wrote: http://www.tomshardware.com/news/hdd...ate,36132.html Defragmenters will have to adopt new algorithms so they position sequential data not in successive clusters within the same track on the same platter but jigsawing the data across multiple platters. So one head can read one cluster of data while a head on the other arm can be reading the next logically sequential cluster of data in building up the data stream. I didn't get that impression from the article. From the blog post: The host computer can treat a single Dual Actuator drive as if it were two separate drives. This means the host computer can ask a single high-capacity drive to retrieve two different data requests simultaneously — delivering data up to twice as fast compared with a single-actuator drive. /blog The host computer is expected to ask the drive to do two things at once, but I don't see that as expecting the drive to read interleaved data and assemble it on the fly. Instead, it sounds more like the following: read two files simultaneously write two files simultaneously write one file while reading another Besides, I'm not worried about defragging. That went out of fashion many years ago. With your interpretation, there would be nothing faster about reading or writing *a* file. Not much point in wasting the money on this drive technology. Statistically, when is a modern computer reading or writing a single file? Almost never, I'd say. So, yes, I think this will be significantly faster, at least in theory. Who knows, it may move the bottleneck somewhere else. |
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