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<blockquote data-quote="RonD" data-source="post: 1197826" data-attributes="member: 117536"><p>I agree with this comment, SSD are good for OS system disk applications that need high speed writes but don't to non-stop heavy write activity like a HTCP/DVR time-shift buffer.</p><p></p><p>The key limitation for SSD, Flash thumb drives is <strong>Write Endurance</strong> the number of times you can erase and write each individual bit in the Flash Memory. SSD designed for main OS system disk applications provide <strong>Write Leveling</strong> or <strong>Wear Leveling</strong> where the SSD internal disk controller logic detects heavy write traffic to some disk locations and does remapping of the writes to other locations to spread out writes over many disk blocks.</p><p></p><p>Typically there are limits to the number of writes you can do to a SSD, for example the Samsung EVO-850 drives are spec'd to support 75 Terabytes (75*1000 GB). If you do 10 GB/hour of time-shifting you would hit the limit in about 7500 hours, so, SSD lifetime would depend on the number of hours/year you use the HTPC. Other SSDs have different limits, and USB-Flash/Thumb drives typically don't spec the number of writes you can do before the drive wears out.</p><p></p><p>The memory bits stored in SSDs, USB-Flash/Thumb use special <strong>Floating Gate Transistors</strong> to save the data bits. For read operations the internal voltages are 1 to 2 volts. For Writes and Erase of data bits the flash memory uses 10 to 20 volt internal signals to clear or write the data bits. When a large number of writes are done to the same transistor it causes wear-out "technical difficulties" and problems trying to read, write, and erase data.</p><p></p><p>If you want more info, google any of the <strong>bold</strong> terms, the Oracle of Google has an infinite number of pages of information on SSDs and Flash drives.</p></blockquote><p></p>
[QUOTE="RonD, post: 1197826, member: 117536"] I agree with this comment, SSD are good for OS system disk applications that need high speed writes but don't to non-stop heavy write activity like a HTCP/DVR time-shift buffer. The key limitation for SSD, Flash thumb drives is [B]Write Endurance[/B] the number of times you can erase and write each individual bit in the Flash Memory. SSD designed for main OS system disk applications provide [B]Write Leveling[/B] or [B]Wear Leveling[/B] where the SSD internal disk controller logic detects heavy write traffic to some disk locations and does remapping of the writes to other locations to spread out writes over many disk blocks. Typically there are limits to the number of writes you can do to a SSD, for example the Samsung EVO-850 drives are spec'd to support 75 Terabytes (75*1000 GB). If you do 10 GB/hour of time-shifting you would hit the limit in about 7500 hours, so, SSD lifetime would depend on the number of hours/year you use the HTPC. Other SSDs have different limits, and USB-Flash/Thumb drives typically don't spec the number of writes you can do before the drive wears out. The memory bits stored in SSDs, USB-Flash/Thumb use special [B]Floating Gate Transistors[/B] to save the data bits. For read operations the internal voltages are 1 to 2 volts. For Writes and Erase of data bits the flash memory uses 10 to 20 volt internal signals to clear or write the data bits. When a large number of writes are done to the same transistor it causes wear-out "technical difficulties" and problems trying to read, write, and erase data. If you want more info, google any of the [B]bold[/B] terms, the Oracle of Google has an infinite number of pages of information on SSDs and Flash drives. [/QUOTE]
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