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07-22-2019, 09:09 AM
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#21
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Thinks s/he gets paid by the post
Join Date: Jun 2017
Location: Western NC
Posts: 4,633
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SSDs are fast enough that I can drop a standard 2.5" SSD into an external USB case and run my iMac via its USB 2.0 (not 3.0) connection.
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07-22-2019, 09:38 AM
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#22
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Thinks s/he gets paid by the post
Join Date: Mar 2012
Posts: 3,931
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 Quote:
Originally Posted by SecondCor521
SSD flash drives typically write data in pages, which are 8KB, 16KB, or 32KB depending on the underlying flash being used. Blocks consist of 256 or 512 or 1024 pages. Erasing is done at the block level. So changing one byte would generally result in writing one new page, although the OS would probably cache the write in some way.
I'm not 100% certain, but most copy programs are probably going to copy in either the smaller of the source or destination page size, or the native OS read/write size, or maybe some least common multiple of those three numbers. A while ago Windows was a native 4KB read/write, but I think there was talk/hope of it going to 16KB. At any rate, most drives should be able to handle sustained sequential 4/8/16/32KB reading and writing quite well.
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Block size is the likely culprit. There are articles out there indicating that with increasing block size, SSD write performance degrades to the point where it is no better than a hard disk.
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07-22-2019, 09:45 AM
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#23
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Thinks s/he gets paid by the post
Join Date: Feb 2012
Location: Northern Ohio
Posts: 3,182
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Spinning and flash drives have very different performance profiles.
I was surprised when I got my Tablo (DVR) and they said do not use flash as your storage.
I tried it anyway and it was obvious that it didn't work well. I swapped in a "slow" cheap hard disk and it performed flawlessly in the Tablo.
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07-22-2019, 10:29 AM
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#24
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Thinks s/he gets paid by the post
Join Date: Feb 2007
Location: Upstate
Posts: 2,951
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What is the SSD being used? What is the system (including OS & level) being used?
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07-22-2019, 11:45 AM
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#25
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Thinks s/he gets paid by the post
Join Date: Feb 2014
Posts: 3,083
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SSDs do best on a SATA connection, not a USB. Also most manufacturers will have a support page to download firmware or optimizing software for the SSD.
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07-23-2019, 12:50 AM
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#26
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Recycles dryer sheets
Join Date: Mar 2013
Posts: 285
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Quote:
Originally Posted by Jerry1
the SSD drive has a cable that is USB-C (plugged into the drive) to USB 3.0 (plugged into the computer).
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I thought USB-C was supposed to be really fast.
Any ideas?
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If you have a USB-C to USB 3.0 (USB-A) cable, you can only get USB 3.0 speed (5 Gbps).
USB-C is just the physical connector. Even if you have USB-C on both ends of your cable, it, the drive, and the computer all must support USB 3.2 (10 Gbps) to get the higher speed.
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