From b5173d60d5a287e66aab97129537ea897e02beb4 Mon Sep 17 00:00:00 2001 From: Adam Dobrawy Date: Sat, 11 Jul 2020 03:01:12 +0200 Subject: [PATCH] Change disk to HDD for clarity (#295) --- README.md | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/README.md b/README.md index 631c484..9127d15 100644 --- a/README.md +++ b/README.md @@ -1613,9 +1613,9 @@ Read 4 KB randomly from SSD* 150,000 ns 150 us ~1GB/se Read 1 MB sequentially from memory 250,000 ns 250 us Round trip within same datacenter 500,000 ns 500 us Read 1 MB sequentially from SSD* 1,000,000 ns 1,000 us 1 ms ~1GB/sec SSD, 4X memory -Disk seek 10,000,000 ns 10,000 us 10 ms 20x datacenter roundtrip +HDD seek 10,000,000 ns 10,000 us 10 ms 20x datacenter roundtrip Read 1 MB sequentially from 1 Gbps 10,000,000 ns 10,000 us 10 ms 40x memory, 10X SSD -Read 1 MB sequentially from disk 30,000,000 ns 30,000 us 30 ms 120x memory, 30X SSD +Read 1 MB sequentially from HDD 30,000,000 ns 30,000 us 30 ms 120x memory, 30X SSD Send packet CA->Netherlands->CA 150,000,000 ns 150,000 us 150 ms Notes @@ -1627,7 +1627,7 @@ Notes Handy metrics based on numbers above: -* Read sequentially from disk at 30 MB/s +* Read sequentially from HDD at 30 MB/s * Read sequentially from 1 Gbps Ethernet at 100 MB/s * Read sequentially from SSD at 1 GB/s * Read sequentially from main memory at 4 GB/s