From ee540f5225072693b725121fe90d7d5c99054869 Mon Sep 17 00:00:00 2001
From: Sandeep Shahi <40382144+sandeepshahi@users.noreply.github.com>
Date: Wed, 25 Jun 2025 12:14:15 +0530
Subject: [PATCH] docs: correct latency number for "Read 1MB sequentially from
 HDD"

Correct the latency number for reading 1MB sequentially from HDD to hold the following statement true:

"Reading 1 MB sequentially from memory takes about 250 microseconds, while reading from SSD takes 4x and from disk takes 80x longer"
---
 README.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/README.md b/README.md
index cedbdfcb..641397f9 100644
--- a/README.md
+++ b/README.md
@@ -1615,7 +1615,7 @@ 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
 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 HDD     30,000,000   ns   30,000 us   30 ms 120x memory, 30X SSD
+Read 1 MB sequentially from HDD     20,000,000   ns   20,000 us   20 ms  80x memory, 20X SSD
 Send packet CA->Netherlands->CA    150,000,000   ns  150,000 us  150 ms
 
 Notes