Explanation/Reference:
Requirements for Restoring Pages
A page restore is subject to the following requirements:
The databases must be using the full or bulk-logged recovery model. Some issues exist if you are using

the bulk-logged model. For more information, see the following section.
Pages in read-only filegroups cannot be restored. Trying to make a filegroup read-only will fail if there is

a page restore going on at the same time in the filegroup.
The restore sequence must start with a full, file, or filegroup backup.

A page restore requires an unbroken chain of log backups up to the current log file, and they must all

be applied so that the page is brought up to date with the current log file.
As in a file-restore sequence, in each restore step, you can add more pages to the roll forward set.

A database backup and page restore cannot be run at the same time.

Bulk-logged Recovery Model and Page Restore
For a database that uses the bulk-logged recovery model, page restore has the following additional

conditions:
Backing up while filegroup or page data is offline is problematic for bulk-logged data, because the

offline data is not recorded in the log. Any offline page can prevent backing up the log. In this cases, consider using
DBCC REPAIR, because this might cause less data loss than restoring to the most recent backup.

If a log backup of a bulk-logged database encounters a bad page, it fails unless WITH

CONTINUE_AFTER_ERROR is specified.

Page restore generally does not work with bulk-logged recovery.

A best practice for performing page restore is to set the database to the full recovery model, and try a

log backup. If the log backup works, you can continue with the page restore. If the log backup fails, you either have to lose work since the previous log backup or you have to try running DBCC must be run with the REPAIR_ALLOW_DATA_LOSS option.