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2T SSD SATA - $250
Direct Chinese marketing - no warranty, no nothing.
Except, it is MICRON branded. My Micron, I bought, a USA-distribution of their 256G SSD, cost me four-times, per GByte, more. IOW if that same drive, cost adjusted for this one, it would have cost me $30 instead of $120 I paid: https://slickdeals.net/f/11690051-2t...-free-shipping Half off the usual market value, still, does tend to bear a little weight on plattered drives. |
2T SSD SATA - $250
Flasherly wrote:
Direct Chinese marketing - no warranty, no nothing. Except, it is MICRON branded. My Micron, I bought, a USA-distribution of their 256G SSD, cost me four-times, per GByte, more. IOW if that same drive, cost adjusted for this one, it would have cost me $30 instead of $120 I paid: https://slickdeals.net/f/11690051-2t...-free-shipping Half off the usual market value, still, does tend to bear a little weight on plattered drives. It uses 3D TLC and is rated at 400TBW. That means, as a 2TB drive, you can write it end to end 200 times. Suitable for backups, subject to that limit. https://www.micron.com/~/media/docum...duct_brief.pdf And there should be QLC based drives soon, so the price might come down a tiny bit more. The TBW could be worse on the QLC based drive (four bits stored per Flash cell, Flash cells chained in cylindrical columns in the chip). Paul |
2T SSD SATA - $250
On 6/12/2018 1:12 PM, Paul wrote:
Flasherly wrote: Direct Chinese marketing - no warranty, no nothing. Except, it is MICRON branded. My Micron, I bought, a USA-distribution of their 256G SSD, cost me four-times, per GByte, more. IOW if that same drive, cost adjusted for this one, it would have cost me $30 instead of $120 I paid: https://slickdeals.net/f/11690051-2t...-free-shipping Half off the usual market value, still, does tend to bear a little weight on plattered drives. It uses 3D TLC and is rated at 400TBW. That means, as a 2TB drive, you can write it end to end 200 times. Suitable for backups, subject to that limit. https://www.micron.com/~/media/docum...duct_brief.pdf And there should be QLC based drives soon, so the price might come down a tiny bit more. The TBW could be worse on the QLC based drive (four bits stored per Flash cell, Flash cells chained in cylindrical columns in the chip). Â*Â* Paul Only 200 writes per sector ? Lynn |
2T SSD SATA - $250
Lynn McGuire wrote:
On 6/12/2018 1:12 PM, Paul wrote: Flasherly wrote: Direct Chinese marketing - no warranty, no nothing. Except, it is MICRON branded. My Micron, I bought, a USA-distribution of their 256G SSD, cost me four-times, per GByte, more. IOW if that same drive, cost adjusted for this one, it would have cost me $30 instead of $120 I paid: https://slickdeals.net/f/11690051-2t...-free-shipping Half off the usual market value, still, does tend to bear a little weight on plattered drives. It uses 3D TLC and is rated at 400TBW. That means, as a 2TB drive, you can write it end to end 200 times. Suitable for backups, subject to that limit. https://www.micron.com/~/media/docum...duct_brief.pdf And there should be QLC based drives soon, so the price might come down a tiny bit more. The TBW could be worse on the QLC based drive (four bits stored per Flash cell, Flash cells chained in cylindrical columns in the chip). Paul Only 200 writes per sector ? Lynn It's a TBW rating, and I presume takes write amplification into account. I don't think I have the skill set to map the flash chip endurance rating, to TBW. Half the time, we can't get an honest endurance number for the flash anyway. You know, even hard drives have TBW ratings now. Something about the expected amount of usage so that a unit will pass the warranty period in one piece. Maybe an enterprise class hard drive might have a 550TBW rating. Which you might easily exceed without too much effort in the run of a year. And the different price ranges of drives, have a rough relationship to the TBW value. The entry level drives have lower values than that. You can also get into the old "IBM problem", where IBM started putting information in datasheets, indicating the DeathStar couldn't be operated 24 hours a day forever. And that notion is leaking back into datasheets now too. It's all a bit discouraging. There hasn't been a stink about it, like when IBM pulled that the first time. The other companies are not getting called on it. There is some move to make platters thinner (so they can stuff more of them into high capacity drives). There was yet another mention of glass platters coming back. The only thing I haven't seen recently, is any more experimental results on "zero flying height" drives. HGST managed to grind the heads off the arm in about 30 days, while flying at zero nanometers, in a lab experiment. At least there's no sign an SSD can't have the power left on all the time :-) Even if the write life leaves something to be desired (imagine if QLC needs "refresh writes" to improve the error rate over time...). All the tech seems to be headed into the dumper. Paul |
2T SSD SATA - $250
On 6/12/2018 2:02 PM, Paul wrote:
Lynn McGuire wrote: On 6/12/2018 1:12 PM, Paul wrote: Flasherly wrote: Direct Chinese marketing - no warranty, no nothing. Except, it is MICRON branded. My Micron, I bought, a USA-distribution of their 256G SSD, cost me four-times, per GByte, more. IOW if that same drive, cost adjusted for this one, it would have cost me $30 instead of $120 I paid: https://slickdeals.net/f/11690051-2t...-free-shipping Half off the usual market value, still, does tend to bear a little weight on plattered drives. It uses 3D TLC and is rated at 400TBW. That means, as a 2TB drive, you can write it end to end 200 times. Suitable for backups, subject to that limit. https://www.micron.com/~/media/docum...duct_brief.pdf And there should be QLC based drives soon, so the price might come down a tiny bit more. The TBW could be worse on the QLC based drive (four bits stored per Flash cell, Flash cells chained in cylindrical columns in the chip). Â*Â*Â* Paul Only 200 writes per sector ? Lynn It's a TBW rating, and I presume takes write amplification into account. I don't think I have the skill set to map the flash chip endurance rating, to TBW. Half the time, we can't get an honest endurance number for the flash anyway. You know, even hard drives have TBW ratings now. Something about the expected amount of usage so that a unit will pass the warranty period in one piece. Maybe an enterprise class hard drive might have a 550TBW rating. Which you might easily exceed without too much effort in the run of a year. And the different price ranges of drives, have a rough relationship to the TBW value. The entry level drives have lower values than that. You can also get into the old "IBM problem", where IBM started putting information in datasheets, indicating the DeathStar couldn't be operated 24 hours a day forever. And that notion is leaking back into datasheets now too. It's all a bit discouraging. There hasn't been a stink about it, like when IBM pulled that the first time. The other companies are not getting called on it. There is some move to make platters thinner (so they can stuff more of them into high capacity drives). There was yet another mention of glass platters coming back. The only thing I haven't seen recently, is any more experimental results on "zero flying height" drives. HGST managed to grind the heads off the arm in about 30 days, while flying at zero nanometers, in a lab experiment. At least there's no sign an SSD can't have the power left on all the time :-) Even if the write life leaves something to be desired (imagine if QLC needs "refresh writes" to improve the error rate over time...). All the tech seems to be headed into the dumper. Â*Â* Paul I was really hoping that we were heading to 100 year capable devices. Lynn |
2T SSD SATA - $250
On Tue, 12 Jun 2018 14:12:05 -0400, Paul
wrote: It uses 3D TLC and is rated at 400TBW. That means, as a 2TB drive, you can write it end to end 200 times. Suitable for backups, subject to that limit. Much generally stated for higher endurance here. How Micron managed to get down to 200, presumably from the linked tech sheet, is really quite amazing. Well, up to something short of a point of leaping tall buildings in a single bound. No, wait, ... it's government inspired technological RAM. https://www.anandtech.com/show/12920...hinese-3d-nand .. . . TLC flash has lower write endurance than both SLC and MLC flash. In general, the more bits of data and levels of charge that a planar NAND flash cell has, the fewer P/E cycles, or write cycles, it supports. SLC flash memory cells can withstand 50,000 to 100,000 P/E cycles before wearing out. A 2-bit planar MLC memory cell typically tolerates no more than 3,000 P/E cycles, and enterprise-grade MLC (eMLC) planar NAND has a limit of 10,000 P/E cycles. A planar TLC memory cell generally can sustain no more than 500 or 1,000 write cycles. However, with 3D NAND technology, the TLC size is larger, and it can approach the endurance level of planar floating-gate-based MLC flash. https://searchstorage.techtarget.com...vel-cell-flash I'd personally question if I'd even want to classify the stuff in a storage capacity. |
2T SSD SATA - $250
On Tue, 12 Jun 2018 13:23:43 -0400, Flasherly
wrote: - My Micron - Mis-statement: No coffee, no putt-putt I own a Crucial 256G SSD drive. |
2T SSD SATA - $250
Flasherly wrote:
I'd personally question if I'd even want to classify the stuff in a storage capacity. It's because of "wear leveling", that the number of write cycles on each cell is approximately the same at end of life. The drive keeps track of how many writes have happened, in order to spread out the wear. The method used on USB flash sticks, is obviously inferior to the method used on SSD drives. (I had two USB TLC sticks die after only one year of very light usage.) I think the methods might have names such as "static wear leveling" and "dynamic wear leveling". Paul |
2T SSD SATA - $250
On Tue, 12 Jun 2018 21:21:39 -0400, Paul
wrote: The method used on USB flash sticks, is obviously inferior to the method used on SSD drives. (I had two USB TLC sticks die after only one year of very light usage.) I could use TLC in an archival capacity. And I'm sure someone would like me to, by selling their product. Earlier mentioned from the prior paper detailing planar charge states, TLC being the more complex, has upwards to approaching ten voltage levels committed at a foundation change state, let alone write capacity. Hence to the later speed factoring for lower performance. At that complexity, no less, when further lowered for congenital degeneration at service life of 200 cycles, I'd wonder, how far is such an extremity from purported more positive aspects of TLC as well mentioned, and if that distance of impositions and limitations are, altogether, to be disposed at an earlier stage of technological interpretation increasingly lacking appreciable relevance. Incredulous as it may seem to read of a SSD failure, and as certain as it is easier to afford to say to stick to a likes leading the forefront of SSD quality, Samsung or Intel, although that can only then underline a greater significance for value given plattered drives that aren't going anywhere anytime soon. |
2T SSD SATA - $250
On Wed, 13 Jun 2018 01:01:58 -0400, Flasherly wrote:
| Incredulous as it may seem to read of a SSD failure, and as certain as | it is easier to afford to say to stick to a likes leading the | forefront of SSD quality, Samsung or Intel, although that can only | then underline a greater significance for value given plattered drives | that aren't going anywhere anytime soon. SSDs serve as system drives in my 4 PCs, but I use HDDs for storage (and regular backups of the SSDs) and have no plans to change that setup. I know lots of others use the same arrangement, so guess many HDDs are still being sold. Larc |
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