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Yes, up to the maximum number of bays that the NAS has. To increase space further, you then have to replace smaller disks with bigger disks, or buy another NAS. With a drive pool, you simply need a free USB socket, and no disks have to be replaced.

Example: if you purchased a two-bay NAS to contain your two 2TB disks, and you later ran out of space, you would have to retire your 2TB disks, and replace them with 4TB or 6TB disks. With a drive pool you could continue to use the 2TB disks, while adding 4TB or 6TB disks as you needed them.

Yes. Synology offer a "Synology Hybrid RAID" format, which makes usable some of the space that is normally unusable, but at the cost of making the data format proprietary. The following "RAID Size Calculator" is a useful tool to see how much usable space different disk sizes and RAID types would give you:

https://www.synology.com/en-us/support/RAID_calculator

Note: other NAS makers are available!

-- from CyberSimian in the UK

<blockquote data-quote="CyberSimian" data-source="post: 1153126" data-attributes="member: 141969">Yes, up to the maximum number of bays that the NAS has.&nbsp; To increase space further, you then have to replace smaller disks with bigger disks, or buy another NAS.&nbsp; With a drive pool, you simply need a free USB socket, and no disks have to be replaced.Example: if you purchased a two-bay NAS to contain your two 2TB disks, and you later ran out of space, you would have to retire your 2TB disks, and replace them with 4TB or 6TB disks.&nbsp; With a drive pool you could continue to use the 2TB disks, while adding 4TB or 6TB disks as you needed them.&nbsp; Yes.&nbsp; Synology offer a &quot;Synology Hybrid RAID&quot; format, which makes usable some of the space that is&nbsp; normally unusable, but at the cost of making the data format proprietary.&nbsp; The following &quot;RAID Size Calculator&quot; is a useful tool to see how much usable space different disk sizes and RAID types would give you:<a href="https://www.synology.com/en-us/support/RAID_calculator" target="_blank">https://www.synology.com/en-us/support/RAID_calculator</a>Note: other NAS makers are available!-- from CyberSimian in the UK</blockquote>

[QUOTE="CyberSimian, post: 1153126, member: 141969"] Yes, up to the maximum number of bays that the NAS has. To increase space further, you then have to replace smaller disks with bigger disks, or buy another NAS. With a drive pool, you simply need a free USB socket, and no disks have to be replaced. Example: if you purchased a two-bay NAS to contain your two 2TB disks, and you later ran out of space, you would have to retire your 2TB disks, and replace them with 4TB or 6TB disks. With a drive pool you could continue to use the 2TB disks, while adding 4TB or 6TB disks as you needed them. Yes. Synology offer a "Synology Hybrid RAID" format, which makes usable some of the space that is normally unusable, but at the cost of making the data format proprietary. The following "RAID Size Calculator" is a useful tool to see how much usable space different disk sizes and RAID types would give you: [URL]https://www.synology.com/en-us/support/RAID_calculator[/URL] Note: other NAS makers are available! -- from CyberSimian in the UK [/QUOTE]