3 ms·

Minimum write size of a modern Flash chip can be ~100MB(!) according to a comment found in a random orange website[1]. So 5MB write every 10 minutes can be 600M

Minimum write size of a modern Flash chip can be ~100MB(!) according to a comment found in a random orange website[1]. So 5MB write every 10 minutes can be 600MB/hr, which is 4.8TB/8-hr-day, which is 24TB/40-hour-week, which is 3.43 DWPD real time for a 1TB drive, and 2500 TBW in 2 years real time[2]. Official quoted specification for SN850 is 600 TBW of write endurance, likely after derating for obvious warranty implications. Incidentally, 2500TB is also a typical endurance figure for many SSDs in this market. Overall, to me, sounds not entirely impossible. I kind of wonder what's the controller says in SMART data, if still alive. On Linux the command is `apt install smartmontools; smartctl -s on /dev/sda; smartctl -A /dev/sda`, and it shall print out a table[4]. On Windows, just install CrystalDiskInfo[3]. 1: https://news.ycombinator.com/item?id=29165202 https://news.ycombinator.com/item?id=29165202 2: DWPD: drive writes per day, TBW: Total Bytes Written - in terabytes 3: https://crystalmark.info/en/software/crystaldiskinfo/ https://crystalmark.info/en/software/crystaldiskinfo/ 4: Note that "Pre-fail" means the value is supposed to change when about to fail and "Old_age" means the value is supposed to indicate age, NOT "this is bad and about to fail" and "this drive is old". It always says all Pre-fail and Old_age. Someone should have changed it to "somewhat_boolean" and "life_remain" long time ago in my opinion.

chromakode 3y ago
Unfortunately the drive didn't appear accessible at all via nvme-cli. Interestingly it shows up in lspci but doesn't get a /dev/nvme. It tends to hang the UEFIs of the two systems I tried it in when they try to read it.
pseudalopex 3y ago
Minimum write size is not erase block size.
kalleboo 3y ago
My machines have always been just constantly writing logs, like every couple seconds (macOS does this), and the write wear has never been anywhere near that bad. The advertised endurance must take into account write amplification for typical loads.
mafuy 3y ago
You were off by factor 1000: GB, not TB
epcoa 3y ago
> Minimum write size of a modern Flash chip can be ~100MB(!) according to a comment found in a random orange website[1] Your reference says erase block size. That is not minimum write size. Sorry but you are clueless (and careless).

chromakode 3y ago

Unfortunately the drive didn't appear accessible at all via nvme-cli. Interestingly it shows up in lspci but doesn't get a /dev/nvme. It tends to hang the UEFIs of the two systems I tried it in when they try to read it.

pseudalopex 3y ago

Minimum write size is not erase block size.

kalleboo 3y ago

My machines have always been just constantly writing logs, like every couple seconds (macOS does this), and the write wear has never been anywhere near that bad. The advertised endurance must take into account write amplification for typical loads.

mafuy 3y ago

You were off by factor 1000: GB, not TB

epcoa 3y ago

> Minimum write size of a modern Flash chip can be ~100MB(!) according to a comment found in a random orange website[1] Your reference says erase block size. That is not minimum write size. Sorry but you are clueless (and careless).