aCuria wrote: speedmaster20d wrote: aCuria wrote:
Something wrong with the card?
I am suspicious about cards using TLC NAND.
On a desktop SSD, TLC achieves speed by writing in SLC mode, but this also means it only write at full speed for at most 1/3 of the rated capacity
Then the SSD needs to do house keeping, which means unpacking the nand used in SLC mode back into TLC to recover space. However when this happens the SSD greatly slows down!
A CF card is just a miniaturized SSD isn’t it
that's right, most of the memory out there is either QLC or TLC. they all use SLC cache to speed things up and then fold the data from the SLC cache into the TLC/QLC blocks. This normally does not reduce the capacity of the SSD but as the drive fills up the SLC cache gets smaller and smaller and eventually the drive writes directly to TLC / QLC blocks, that's why drives often slow down as they fill up
for the CFexpress cards the SLC cache is permanent, i.e. they reserve some blocks as SLC and that's why the capacity is a bit funny like 480Gb instead of there more standard 512 GB
in this case I think the issue could be the memory controller chip or the FW that has hiccups. for example they card may be performing "garbage collection" which refers to a term SSD's use for moving data around to avoid having partially programmed blocks.... if the garbage collection collides with SLC to TLS folding it can cause this kind of hiccups
at the end of the day this seems to be an issue with this brand of card, that happens to be one of the cheapest on the market so maybe something had to give.... it could just fine for other usage but shooting heavy bursts back to back with A1 / A9 series could be exposing a corner case that was dropped in the design of the card.
It's not simple like that, the size of cache is not simply the difference and the content in cache is flushed to the main blocks in parallel at the same time, it doesn't just sit there to fill up. But what enables the deep burst is the buffer inside the camera (DRAM), not the cache in the card.... once the camera buffer is full the card will be limiting the burst rate quite significantly, as Sony cameras only support NVME gen 3 protocol between the card and the camera which is obsolete and quite slow compared to today's gen 4
aCuria wrote: speedmaster20d wrote: aCuria wrote:
Something wrong with the card?
I am suspicious about cards using TLC NAND.
On a desktop SSD, TLC achieves speed by writing in SLC mode, but this also means it only write at full speed for at most 1/3 of the rated capacity
Then the SSD needs to do house keeping, which means unpacking the nand used in SLC mode back into TLC to recover space. However when this happens the SSD greatly slows down!
A CF card is just a miniaturized SSD isn’t it
that's right, most of the memory out there is either QLC or TLC. they all use SLC cache to speed things up and then fold the data from the SLC cache into the TLC/QLC blocks. This normally does not reduce the capacity of the SSD but as the drive fills up the SLC cache gets smaller and smaller and eventually the drive writes directly to TLC / QLC blocks, that's why drives often slow down as they fill up
for the CFexpress cards the SLC cache is permanent, i.e. they reserve some blocks as SLC and that's why the capacity is a bit funny like 480Gb instead of there more standard 512 GB
in this case I think the issue could be the memory controller chip or the FW that has hiccups. for example they card may be performing "garbage collection" which refers to a term SSD's use for moving data around to avoid having partially programmed blocks.... if the garbage collection collides with SLC to TLS folding it can cause this kind of hiccups
at the end of the day this seems to be an issue with this brand of card, that happens to be one of the cheapest on the market so maybe something had to give.... it could just fine for other usage but shooting heavy bursts back to back with A1 / A9 series could be exposing a corner case that was dropped in the design of the card.
It's not simple like that, the size of cache is not simply the difference and the content in cache is flushed to the main blocks in parallel at the same time, it doesn't just sit there to fill up. But what enables the deep burst is the buffer inside the camera (DRAM), not the cache in the card.... once the camera buffer is full the card will be limiting the burst rate quite significantly, as Sony cameras only support NVME gen 3 protocol between the card and the camera which is obsolete and quite slow by today's gen 4
aCuria wrote: speedmaster20d wrote: aCuria wrote:
Something wrong with the card?
I am suspicious about cards using TLC NAND.
On a desktop SSD, TLC achieves speed by writing in SLC mode, but this also means it only write at full speed for at most 1/3 of the rated capacity
Then the SSD needs to do house keeping, which means unpacking the nand used in SLC mode back into TLC to recover space. However when this happens the SSD greatly slows down!
A CF card is just a miniaturized SSD isn’t it
that's right, most of the memory out there is either QLC or TLC. they all use SLC cache to speed things up and then fold the data from the SLC cache into the TLC/QLC blocks. This normally does not reduce the capacity of the SSD but as the drive fills up the SLC cache gets smaller and smaller and eventually the drive writes directly to TLC / QLC blocks, that's why drives often slow down as they fill up
for the CFexpress cards the SLC cache is permanent, i.e. they reserve some blocks as SLC and that's why the capacity is a bit funny like 480Gb instead of there more standard 512 GB
in this case I think the issue could be the memory controller chip or the FW that has hiccups. for example they card may be performing "garbage collection" which refers to a term SSD's use for moving data around to avoid having partially programmed blocks.... if the garbage collection collides with SLC to TLS folding it can cause this kind of hiccups
at the end of the day this seems to be an issue with this brand of card, that happens to be one of the cheapest on the market so maybe something had to give.... it could just fine for other usage but shooting heavy bursts back to back with A1 / A9 series could be exposing a corner case that was dropped in the design of the card.
It's not simple like that, the size of cache is not simply the difference and the content in cache is flushed to the main blocks in parallel at the same time, it doesn't just sit there to fill up. But what enables the deep burst is the buffer inside the camera (DRAM), not the cache in the card.... once the camera buffer is full the card will be limiting the burst rate quite significantly, as Sony cameras only support NVME gen 3 protocol between the card and the camera
aCuria wrote: speedmaster20d wrote: aCuria wrote:
Something wrong with the card?
I am suspicious about cards using TLC NAND.
On a desktop SSD, TLC achieves speed by writing in SLC mode, but this also means it only write at full speed for at most 1/3 of the rated capacity
Then the SSD needs to do house keeping, which means unpacking the nand used in SLC mode back into TLC to recover space. However when this happens the SSD greatly slows down!
A CF card is just a miniaturized SSD isn’t it
that's right, most of the memory out there is either QLC or TLC. they all use SLC cache to speed things up and then fold the data from the SLC cache into the TLC/QLC blocks. This normally does not reduce the capacity of the SSD but as the drive fills up the SLC cache gets smaller and smaller and eventually the drive writes directly to TLC / QLC blocks, that's why drives often slow down as they fill up
for the CFexpress cards the SLC cache is permanent, i.e. they reserve some blocks as SLC and that's why the capacity is a bit funny like 480Gb instead of there more standard 512 GB
in this case I think the issue could be the memory controller chip or the FW that has hiccups. for example they card may be performing "garbage collection" which refers to a term SSD's use for moving data around to avoid having partially programmed blocks.... if the garbage collection collides with SLC to TLS folding it can cause this kind of hiccups
at the end of the day this seems to be an issue with this brand of card, that happens to be one of the cheapest on the market so maybe something had to give.... it could just fine for other usage but shooting heavy bursts back to back with A1 / A9 series could be exposing a corner case that was dropped in the design of the card.
It's not simple like that, the size of cache is not simply the difference and the content in cache is flushed to the main blocks in parallel at the same time, it doesn't just sit there to fill up. What enables the deep burst is the buffer inside the camera (DRAM), not the cache in the card.... once the camera buffer is full the card will be limiting the burst rate quite significantly, as Sony cameras only support NVME gen 3 protocol between the card and the camera
aCuria wrote: speedmaster20d wrote: aCuria wrote:
Something wrong with the card?
I am suspicious about cards using TLC NAND.
On a desktop SSD, TLC achieves speed by writing in SLC mode, but this also means it only write at full speed for at most 1/3 of the rated capacity
Then the SSD needs to do house keeping, which means unpacking the nand used in SLC mode back into TLC to recover space. However when this happens the SSD greatly slows down!
A CF card is just a miniaturized SSD isn’t it
that's right, most of the memory out there is either QLC or TLC. they all use SLC cache to speed things up and then fold the data from the SLC cache into the TLC/QLC blocks. This normally does not reduce the capacity of the SSD but as the drive fills up the SLC cache gets smaller and smaller and eventually the drive writes directly to TLC / QLC blocks, that's why drives often slow down as they fill up
for the CFexpress cards the SLC cache is permanent, i.e. they reserve some blocks as SLC and that's why the capacity is a bit funny like 480Gb instead of there more standard 512 GB
in this case I think the issue could be the memory controller chip or the FW that has hiccups. for example they card may be performing "garbage collection" which refers to a term SSD's use for moving data around to avoid having partially programmed blocks.... if the garbage collection collides with SLC to TLS folding it can cause this kind of hiccups
at the end of the day this seems to be an issue with this brand of card, that happens to be one of the cheapest on the market so maybe something had to give.... it could just fine for other usage but shooting heavy bursts back to back with A1 / A9 series could be exposing a corner case that was dropped in the design of the card.
It's not simple like that, the size of cache is not simply the difference and the content in cache is copied to the main blocks in parallel at the same time. What enables the deep burst is the buffer inside the camera (DRAM), not the cache in the card.... once the camera buffer is full the card will be limiting the burst rate quite significantly, as Sony cameras only support NVME gen 3 protocol between the card and the camera
aCuria wrote: speedmaster20d wrote: aCuria wrote:
Something wrong with the card?
I am suspicious about cards using TLC NAND.
On a desktop SSD, TLC achieves speed by writing in SLC mode, but this also means it only write at full speed for at most 1/3 of the rated capacity
Then the SSD needs to do house keeping, which means unpacking the nand used in SLC mode back into TLC to recover space. However when this happens the SSD greatly slows down!
A CF card is just a miniaturized SSD isn’t it
that's right, most of the memory out there is either QLC or TLC. they all use SLC cache to speed things up and then fold the data from the SLC cache into the TLC/QLC blocks. This normally does not reduce the capacity of the SSD but as the drive fills up the SLC cache gets smaller and smaller and eventually the drive writes directly to TLC / QLC blocks, that's why drives often slow down as they fill up
for the CFexpress cards the SLC cache is permanent, i.e. they reserve some blocks as SLC and that's why the capacity is a bit funny like 480Gb instead of there more standard 512 GB
in this case I think the issue could be the memory controller chip or the FW that has hiccups. for example they card may be performing "garbage collection" which refers to a term SSD's use for moving data around to avoid having partially programmed blocks.... if the garbage collection collides with SLC to TLS folding it can cause this kind of hiccups
at the end of the day this seems to be an issue with this brand of card, that happens to be one of the cheapest on the market so maybe something had to give.... it could just fine for other usage but shooting heavy bursts back to back with A1 / A9 series could be exposing a corner case that was dropped in the design of the card.
no it's not simple like that, the size of buffer is not simply the difference and the buffer content is copied to the main blocks in parallel at the same time. What enables the deep burst is the buffer inside the camera (DRAM), not the cache in the card.... once the camera buffer is full the card will be limiting the burst rate quite significantly, as Sony cameras only support NVME gen 3 protocol between the card and the camera
aCuria wrote: speedmaster20d wrote: aCuria wrote:
Something wrong with the card?
I am suspicious about cards using TLC NAND.
On a desktop SSD, TLC achieves speed by writing in SLC mode, but this also means it only write at full speed for at most 1/3 of the rated capacity
Then the SSD needs to do house keeping, which means unpacking the nand used in SLC mode back into TLC to recover space. However when this happens the SSD greatly slows down!
A CF card is just a miniaturized SSD isn’t it
that's right, most of the memory out there is either QLC or TLC. they all use SLC cache to speed things up and then fold the data from the SLC cache into the TLC/QLC blocks. This normally does not reduce the capacity of the SSD but as the drive fills up the SLC cache gets smaller and smaller and eventually the drive writes directly to TLC / QLC blocks, that's why drives often slow down as they fill up
for the CFexpress cards the SLC cache is permanent, i.e. they reserve some blocks as SLC and that's why the capacity is a bit funny like 480Gb instead of there more standard 512 GB
in this case I think the issue could be the memory controller chip or the FW that has hiccups. for example they card may be performing "garbage collection" which refers to a term SSD's use for moving data around to avoid having partially programmed blocks.... if the garbage collection collides with SLC to TLS folding it can cause this kind of hiccups
at the end of the day this seems to be an issue with this brand of card, that happens to be one of the cheapest on the market so maybe something had to give.... it could just fine for other usage but shooting heavy bursts back to back with A1 / A9 series could be exposing a corner case that was dropped in the design of the card.
no it's not simple like that, the size of buffer is not simply the difference and the buffer content is copied to the main blocks in parallel at the same time. What enables the deep burst is the buffer inside the camera (DRAM), not the cache in the card.... once that is full the card will be limiting the burst rate quite significantly, as Sony cameras only support NVME gen 3 protocol between the card and the camera
aCuria wrote: speedmaster20d wrote: aCuria wrote:
Something wrong with the card?
I am suspicious about cards using TLC NAND.
On a desktop SSD, TLC achieves speed by writing in SLC mode, but this also means it only write at full speed for at most 1/3 of the rated capacity
Then the SSD needs to do house keeping, which means unpacking the nand used in SLC mode back into TLC to recover space. However when this happens the SSD greatly slows down!
A CF card is just a miniaturized SSD isn’t it
that's right, most of the memory out there is either QLC or TLC. they all use SLC cache to speed things up and then fold the data from the SLC cache into the TLC/QLC blocks. This normally does not reduce the capacity of the SSD but as the drive fills up the SLC cache gets smaller and smaller and eventually the drive writes directly to TLC / QLC blocks, that's why drives often slow down as they fill up
for the CFexpress cards the SLC cache is permanent, i.e. they reserve some blocks as SLC and that's why the capacity is a bit funny like 480Gb instead of there more standard 512 GB
in this case I think the issue could be the memory controller chip or the FW that has hiccups. for example they card may be performing "garbage collection" which refers to a term SSD's use for moving data around to avoid having partially programmed blocks.... if the garbage collection collides with SLC to TLS folding it can cause this kind of hiccups
at the end of the day this seems to be an issue with this brand of card, that happens to be one of the cheapest on the market so maybe something had to give.... it could just fine for other usage but shooting heavy bursts back to back with A1 / A9 series could be exposing a corner case that was dropped in the design of the card.
no it's not simple like that, the size of buffer is not simply the difference and the buffer content is copied to the main blocks as it is written to in parallel. what enables the deep burst is the buffer inside the camera (DRAM) once that is full the card will be limiting the burst rate quite significantly, as Sony cameras only support NVME gen 3 protocol between the card and the camera
aCuria wrote: speedmaster20d wrote: aCuria wrote:
Something wrong with the card?
I am suspicious about cards using TLC NAND.
On a desktop SSD, TLC achieves speed by writing in SLC mode, but this also means it only write at full speed for at most 1/3 of the rated capacity
Then the SSD needs to do house keeping, which means unpacking the nand used in SLC mode back into TLC to recover space. However when this happens the SSD greatly slows down!
A CF card is just a miniaturized SSD isn’t it
that's right, most of the memory out there is either QLC or TLC. they all use SLC cache to speed things up and then fold the data from the SLC cache into the TLC/QLC blocks. This normally does not reduce the capacity of the SSD but as the drive fills up the SLC cache gets smaller and smaller and eventually the drive writes directly to TLC / QLC blocks, that's why drives often slow down as they fill up
for the CFexpress cards the SLC cache is permanent, i.e. they reserve some blocks as SLC and that's why the capacity is a bit funny like 480Gb instead of there more standard 512 GB
in this case I think the issue could be the memory controller chip or the FW that has hiccups. for example they card may be performing "garbage collection" which refers to a term SSD's use for moving data around to avoid having partially programmed blocks.... if the garbage collection collides with SLC to TLS folding it can cause this kind of hiccups
at the end of the day this seems to be an issue with this brand of card, that happens to be one of the cheapest on the market so maybe something had to give.... it could just fine for other usage but shooting heavy bursts back to back with A1 / A9 series could be exposing a corner case that was dropped in the design of the card.
no it's not simple like that, the size of buffer is not simply the difference and the buffer content is copied to the main blocks as it is written to in parallel.
aCuria wrote: speedmaster20d wrote: aCuria wrote:
Something wrong with the card?
I am suspicious about cards using TLC NAND.
On a desktop SSD, TLC achieves speed by writing in SLC mode, but this also means it only write at full speed for at most 1/3 of the rated capacity
Then the SSD needs to do house keeping, which means unpacking the nand used in SLC mode back into TLC to recover space. However when this happens the SSD greatly slows down!
A CF card is just a miniaturized SSD isn’t it
that's right, most of the memory out there is either QLC or TLC. they all use SLC cache to speed things up and then fold the data from the SLC cache into the TLC/QLC blocks. This normally does not reduce the capacity of the SSD but as the drive fills up the SLC cache gets smaller and smaller and eventually the drive writes directly to TLC / QLC blocks, that's why drives often slow down as they fill up
for the CFexpress cards the SLC cache is permanent, i.e. they reserve some blocks as SLC and that's why the capacity is a bit funny like 480Gb instead of there more standard 512 GB
in this case I think the issue could be the memory controller chip or the FW that has hiccups. for example they card may be performing "garbage collection" which refers to a term SSD's use for moving data around to avoid having partially programmed blocks.... if the garbage collection collides with SLC to TLS folding it can cause this kind of hiccups
at the end of the day this seems to be an issue with this brand of card, that happens to be one of the cheapest on the market so maybe something had to give.... it could just fine for other usage but shooting heavy bursts back to back with A1 / A9 series could be exposing a corner case that was dropped in the design of the card.
