Can RAID5 and RAID0 be combined this way?

I have a DS423+ with three 20TB drives. I want to reserve 4TB for backing up files and documents in a RAID5 pool, and use the rest for ripped Blu-ray movies in RAID0, since I already have backups. Can I set it up this way, or do I need to dedicate whole drives to the RAID5 pool?

Tagged: NAS

NAS data recovery

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Jace Elric

Participant

September 30, 2025 at 9:39 am

On a Synology DS423+, you can’t split a single drive between different RAID types because RAID5 and RAID0 work at the whole-disk level. Each storage pool or volume has to use full drives, so you can’t just carve out part of each 20 TB drive for RAID5 and use the rest for RAID0. To have both a backup area and a fast RAID0 pool for movies, you’ll need to dedicate some drives to RAID5 and others to RAID0, or use a few extra external drives for backups.

Jace Elric

Participant

September 30, 2025 at 9:33 am

On a Synology DS423+, you can’t split a single drive between different RAID types. RAID5 and RAID0 work at the whole-disk level, so each storage pool or volume has to use full drives. You’d need to dedicate entire drives to a RAID5 pool for backups—you can’t just carve out a bit of each 20 TB drive and use the rest for RAID0. If you want both a safe backup area and a fast RAID0 pool for movies, you’ll either have to dedicate some drives to RAID5 and others to RAID0, or grab a couple of extra external drives for backups.

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