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3TB is correct, if you choose RAID 5 (Stripe set with parity) however if you choose other options you might loose more space<br />
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Here is a raid Calculator to assist with these calculations<br />
<a href="http://www.raid-calculator.com/Default.aspx" rel="ugc">http://www.raid-calculator.com/Default.aspx</a>
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3TB is correct, if you choose RAID 5 (Stripe set with parity) however if you choose other options you might loose more space

Here is a raid Calculator to assist with these calculations
http://www.raid-calculator.com/Default.aspx [http://www.raid-calculator.com/Default.aspx]

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Don't forget to factor in filesystem overheads and the effect of partitioning, and oh don't be caught out by the 1000x1000 v 1024x1024 debate on reporting of sizes
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Don't forget to factor in filesystem overheads and the effect of partitioning, and oh don't be caught out by the 1000x1000 v 1024x1024 debate on reporting of sizes

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I have &nbsp;4 hard drive each with 1TB &nbsp;running Raid 5 what should my total usable space be?
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I have  4 hard drive each with 1TB  running Raid 5 what should my total usable space be?

Raid 5

Storage devices include any device used for storing and retrieving digital information. Hard disk drives (HDDs) use one or more rigid ("hard") rapidly rotating disks (platters) coated with magnetic material. Data is accessed in a random-access manner, meaning that individual blocks of data can be stored or retrieved in any order and not only sequentially. The primary competing technology for secondary storage is flash memory in the form of solid-state drives (SSDs), but HDDs remain the dominant medium for secondary storage due to advantages in price per bit and per-device recording capacity. CD-RW (Compact Disc-ReWritable) is a digital optical disc storage format that allows information to be stored outside the mechanical HDD.