What is the difference between Hot-Swap and Simple-Swap?
Here is an example of some IBM drives with these two variations:
IBM 600GB 10,000 RPM SAS 2.5-inch Gen2 Hot-Swap hybrid Hard drive (G2HS Hot Swap) – Part numbers 00AD102 and 00AD103
IBM 600GB 10,000 RPM SAS 2.5-inch Gen2 Hot-Swap hybrid Hard drive (G2SS Simple Swap) – Part numbers 00AD107 and 00AD108
Per Lenovo, “Simple Swap hard drives are not compatible in a hot swap backplane even though they seem to fit.”
What that means is the G2HS hot-swap uses an SATA connector for power while the G2SS simple-swap uses a 4 pin molex for power.
Also, simple-swap are not hot-swappable (system must be powered down to change them out).
https://www.ibm.com/support/knowledgecenter/STAV45/com.ibm.sonas.doc/bb1gt_t_remsimpleswap.html
HP has a similar confusing naming convention, but they use “hot-swap and wired”.
Hope this helps!
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SATA Power Connector
Molex 4 Pin Connector