which are the hard drive connectors?

On modern hard drives it will vary. The flatter black slot-style connectors are SATA power connectors (SATA-1.5/3.0/6.0) while the older White Four-Pin are for PATA (ATA-66/100/133). Usually all modern power supplies, even those for low power or older systems, will now carry both, or contain adapters for PATA-to-SATA or vice versa.

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Cooler Master Elite Power - 400W Power Supply

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A blend of performance and value, the Cooler Master Elite RS400-PSARJ3-US Power Supply is great for cost-conscious users wanting to build a reliable yet budget-friendly system. Robust power output means your rig can run stably and reliably, while various safety protections safeguard your valuable components. One quiet fan provides great air flow so your PSU stays cool, even at demanding load levels.

Robust PowerThis unit delivers a robust 400W of maximum power for your rig. And two +12V rails provide sufficient juice for your multi-core CPU.
Comprehensive ProtectionOutput OVP/OCP/OPP/SCP protection is built in to avoid device damage.
Silent Cooling FanThe low-noise 120mm fan produces a massive air flow that keeps your PSU running cool and always at peak performance.