Hi,
I already know that when SSD gets full, it "slows down" since there's not enough space to correctly perform GC, but does this "slow down" affects read or write speed?
My 238GiB SSD is primarily used as read-only drive. It's filled with 237GiB of data and won't be written to in the next 3 months. HD Tune showed average read speed 460MB/s for 1MB block size, which is still OK, but it seems to me that 4K read/access times got a bit worse, now it's 75MB/s and 0.138ms access
I already know that when SSD gets full, it "slows down" since there's not enough space to correctly perform GC, but does this "slow down" affects read or write speed?
My 238GiB SSD is primarily used as read-only drive. It's filled with 237GiB of data and won't be written to in the next 3 months. HD Tune showed average read speed 460MB/s for 1MB block size, which is still OK, but it seems to me that 4K read/access times got a bit worse, now it's 75MB/s and 0.138ms access
But it appears to me that you've answered your own question. If the read endurance for an SSD is unlimited, then I would have thought there shouldn't be any reason why the speed at which the data is copied would be the same. Again I'm not an expert, but if that's not true then it would depend on if the data takes one or two lane traffic, so to speak. If written data takes a different path to data that is read from the drive, then the read speed shouldn't decrease. But if the written data moves with data to be read, then the path would be "worn down" from all the writes, making it harder to read, no? 
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