Raid 0 with 1xBlack 1xBlue

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burakdatlife

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May 2, 2017
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Hello everyone , i already have 1x 1 TB WD Blue 7200 64MB drive

and im planning to buy another 1x WD BLACK 1 TB 7200 64 drive

losing data is not very important for me will i get speed improvment on my drive if i made it ?
 
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Solandri

Solandri

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Jan 4, 2012
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A SSD will be hundreds of times faster.

RAID 0 boosts your sequential speeds. HDDs already have decent sequential speeds - about 150-200 MB/s for newer drives. By comparison, a SATA SSD only has about 500 MB/s sequential speeds, so not much faster.

RAID 0 does nothing for 4k (small file) speeds. HDDs are particularly bad at reading or writing small files. 1.5 MB/s is about the fastest you'll see, and it's not uncommon for a HDD to score less than 1 MB/s. A SSD usually scores 30-70 MB/s at 4k read/writes, 150-350 MB/s if you have queuing enabled (AHCI mode). So the SSD will be hundreds of times faster than the HDD. On top of this, the overall speed of your drive is mostly affected by the slowest operation - whatever is bottlenecking the drive. So it's the 4k speeds which matter the most in general use.

RAID 0 does not help 4k speeds because the smallest sector the filesystem can write is 4k. If you try to write a 4k file on RAID 0, the RAID system breaks it into two 2k files and sends one to each drive. Since the smallest sector size is 4k, each drive simply pads the 2k fragment out to 4k. And both drives end up doing the equivalent of writing a 4k file. Usually the overhead of RAID 0 makes 4k speeds slower than a single drive.

Forget about RAID 0 and get a SSD.
 
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