How much faster is the memory usually than the disk?

Question

IDE,SCSI,SSD,SATA or all of those.

Answer 1

2016 Hardware Update: Actual read/write seq throughput

Now the Samsung 940 PRO SSD

• reading at 3,500 MB/sec
• writing at 2,100 MB/sec

Ram got faster too

• reading at 61,000 MB/sec
• writing at 48,000 MB/sec..

So now using this metric, RAM looks to be 20x faster than the stuff around when @ChrisW wrote his answer, not 100,000. And, SSDs are 10 times faster than RAM was when he wrote this question.

An important consideration is that we're only measuring memory bandwidth not latency.