New
#600
Toshibas of that vintage (like my L750, System One in My Computers below) were partitioned with a D: drive as the last partition, occupying half the drive, so 250GB on a 500GB disk. Unlike most other OEMs who kept their Windows 7 recovery image in a hidden partition, Toshiba put theirs in a folder named HDDRecovery on the D: drive. If you have not already done so you can delete this folder and regain 13GB of free space on D.
My Toshiba was upgraded from W7 to W10 in 2015, then had every Feature Update since, up to its current 21H1. I've tracked down and removed all unnecessary OEM bloatware, so I've not felt compelled to do a clean install. But if you wanted to, then in the W10 Custom install just delete the first three partitions, leaving D: as it is. Then install into the 250GB unallocated space created. W10 will install correctly and create all the partitions it requires (as if it were installing on a 250GB drive) leaving the D: partition intact and untouched.
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