Yousuf Khan wrote:

So one of my oldest SSD's just finally had a bad misfire. One of its
memory cells seems to have gone bad, and it happened to be my boot
drive, so I had to restore to a new SSD from backups. That took a fair
bit of time to restore, but the new drive is twice as large as the old
one, but it created a partition that is the same size as the original. I
expected that, but I also expected that I should be able to extend the
partition after the restore to fill the new drive's size. However going
into disk management it doesn't allow me to fill up that entire drive.
Any idea what's going on here?

You mean Microsoft disk management? Use a real partitioning utility. I got a
free one several years ago downloaded from Amazon that works... Partition
Master Technician 13.0 Portable. See if it's still available. If you make
Windows backups (like everybody should), you don't even need to keep it on
your system, just don't re-install it after the next restore.