I’m an expert computer user, and I’m having trouble getting the proper speed on my SanDisk Extreme Pro 128GB stick. :(
In summary, I used to be able get >100MB/s write speed into the device, but can now only get 20-30MB/s write speed on the same USB 3.0 port doing the same type of file copy operation under Windows 10 Pro.
This started happening after I ended up using >95% of the device capacity when I tried to copy a very large file over. :(
I have used this device no more 50-100 times, so I don’t think it’s hitting the P/E cycle limit. Given that this device does not support TRIM, I tried writing zero to the entire LBA range, and it helped restore the performance a bit initially to >100MB/s, but quickly dropped back down to 20-30MB/s again as I used the device beyond ~20% capacity or so. :(
I have tried formatting the device with both MBR and GPT parittion tables, as well as shifting the initial GPT partition offset to start at 64MB. I also tried exFAT (with 1MB allocation unit size) or NTFS (with 64KB allocation unit size). Even after all these, I’m still getting that poor performance. :(
I’m wondering if I should RMA this device, or if there’s other tricks that I should have tried but haven’t?
(ie, is there a SanDisk tool for cleaning this USB device to completely reset its FTL state?)