Here’s a comparison of read/write speeds for different storage types: HDD, SSD, NVMe SSD, and RAM Disk:
| Storage Type | Read Speed (MB/s) | Write Speed (MB/s) | Latency (ms) | IOPS |
|---|---|---|---|---|
| HDD | 80–200 | 80–200 | 10–15 | 50–200 |
| SATA SSD | 450–560 | 450–560 | 0.1 | 10,000–90,000 |
| NVMe SSD | 2,000–7,000 | 2,000–7,000 | 0.02–0.1 | 500,000–1,000,000 |
| RAM Disk | 10,000–50,000 | 10,000–50,000 | 0.001 | Millions |
- HDD: Suitable for archival storage and bulk data with low performance needs.
- SATA SSD: Great for general-purpose use with much better performance than HDDs.
- NVMe SSD: Ideal for high-performance applications, large data processing, and gaming.
- RAM Disk: Ultra-fast temporary storage, perfect for caching and real-time high-speed operations, but volatile and expensive.
To mount a 30GB RAM disk at /ram, follow these steps:
1. Create the Mount Director
sudo mkdir /ram
2. Mount the RAM Disk
sudo mount -t tmpfs -o size=30G tmpfs /ram
3. Verify the RAM Disk
df -h | grep ram
You should see something like this:
tmpfs 30G 0 30G 0% /ram
4. Make the RAM Disk Persistent
Open /etc/fstab for editing: (before do anything backup the file)
sudo nano /etc/fstab
Add the following line at the end:
tmpfs /ram tmpfs size=30G 0 0
Test the configuration:
sudo mount -a
6. Remove the RAM Disk (If Needed)
sudo umount /ram
Delete the directory:
sudo rmdir /ram
Remember: Data is lost on power-off or reboot.