Thunderbird is constantly, intermittently accessing my D: drive. But it shouldn't be -- the program, and my profile, sigs, mail, etc. are stored my my C: drive, which is an SSD. But for some reason, the program is causing my D: HDD to spin up every minute or so and keep spinning for about 40 seconds. I'm running TB 68.8.0 on Win 10 Professional. My Download directory (for attachments) is on D:, as is my OneDrive and Documents directory. My Path variable has no D: directories in it. I have several hundred thousand messages in local folder and several hundred thousand in imap folders. There is a total of about 1.2 million separate files in my profile, amounting to about 100 GB if I recall correctly. My largest accounts are gmail accounts. I have disabled sync and subscribe for the All folders but the problem persists. Process Monitor / File Summary attributed about half of the hard disk accesses to gContactSync. I don't know why it would be accessing D:. In any case, the problem persists even after disabling that addon. Any help in tracking down and eliminating these disk accesses would be great, thanks!