By the next generation SSDs will be fine, there are new memory technologies that perform better and don't have the aging issue that the memory currently used in SSDs does.
AFAIK the HDD in a PS4 is a standard 2.5 inch SATA device such as the laptop drives. I believe that the only physical restriction is that the drive can't be one of the 'fat' drives that are thicker to accommodate an additional platter like some of the really big 2.5 inch HDDs do.
Specifically the 2.5 inch SATA drive must be no thicker than 9.5mm. Sony's official page contains a disclaimer that not all drives operate and you should check their list of supported drives. IIRC this is down to limitations of the FAT32 standard format, and the ways that different manufacturers overcome it in their drive BIOS and formatting, resulting in some drives not acting the way systems expect. So either the system firmware has to be modified to accommodate, or the drive does, or you get a different drive. So it is wise to check the reviews to ensure that the drive you select works.
When buying an HDD pay attention to the on-board cache the drive itself has, the larger the cache the better. A 5400rpm drive with a 64MB cache (WD used to make one) works great, as fast as most 7200rpm drives. If you have a choice of 7200rpm drives and one has a larger cache than the other, it's worth a few extra $ to get the larger cache.

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