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The 15TB drive packs in 1108 Gbit/inch2. That is, each bit is a square of side 8.5nm. This is small but the transistors in flash are smaller [1]. As mind blo
by femto 8y ago
The 15TB drive packs in 1108 Gbit/inch2. That is, each bit is a square of side 8.5nm. This is small but the transistors in flash are smaller [1]. As mind blowing as the numbers (for both technologies) are in the referenced article, that article is now 2.5 years old. Is anyone aware of more recent numbers?
[1] https://www.computerworld.com/article/3030642/data-storage/flash-memorys-density-surpasses-hard-drives-for-first-time.html https://www.computerworld.com/article/3030642/data-storage/f...
- Lramseyer 8y agoFrom my experience in the HDD industry I remember that a magnetic bit of data is about 13-15nm long and about 40-60nm wide (narrower tracks for SMR.) The length of a bit is constrained by the grain size of the magnetic media. However, the width of a bit (prior to SMR) is actually constrained by the size of the write head. I don't remember why, but I think it has to do with the fact that the write current is like 40 mA, and the magnetic flux density on the write element is like 1.5T (no that's not a typo) I'm not an expert on transistor pitches, but here's a chart from Wikipedia for the 10nm - https://en.wikipedia.org/wiki/10_nanometer https://en.wikipedia.org/wiki/10_nanometer It's kind of impressive for HDDs considering that it's a 2 inch long mechanical arm that is able to move with that level of precision.