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Hard disks
There are two types of storage drives:
- SSD (Solid-State Drive).
- HDD (Hard Disk Drive).
SSDs differ by three criteria:
- Logical interface: SATA, NVMe.
- Physical interface (connector): mSATA, PCI-Express, U.2, SATA, M.2.
- Form-factor: 2.5", mSATA, M.2, PCI-Express, U.2.
Storage devices can communicate with host bus adapters using two interfaces: PATA (Parallel ATA) or SATA (Serial ATA).
PATA interface was superseded by SATA in 2003, so you will face a PATA interface only on old machines. That’s why we won’t consider it here.
SATA
There are several revisions of this interface:
- SATA-1
- SATA-2
- SATA-3
| Generation | Frequency, GHz | Bandwidth, Gb/s | Bandwidth MB/s |
|---|---|---|---|
| SATA-1 | 1.5 | 1.5 | 150 |
| SATA-2 | 3.0 | 3.0 | 300 |
| SATA-3 | 6.0 | 6.0 | 600 |
All the SATA generations are compatible with each other.
All they have the same connector.
M.2
…
mSATA
…