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3.5 inch HDD - Location of bottom mounting holes

This is a circuit diagram symbol for a variable-capacitance diode.

Variable-capacitance diodes are abbreviated as VCDs. They are also called varicap diodes.
Variable-capacitance diodes has a variable capacitance which is a function of the voltage between anode and cathode.
General-purpose diodes are used for rectification and signal detection, and variable-capacitance diodes are used for RF impedance matching in automatic tuners and transmitters.

Location of bottom mounting holes

Location of bottom mounting holes is different as following figure 1 and 2.

Form Factor of 3.5" Disk Drive

Note:
SFF-8301 specification from the industry-standard Small Form Factor (SFF) committee defines the dimensions for 3.5 inch Form Factor Disk Drives.
SFF-8301 defines three pairs of bottom mounting holes as follows:

Source: SFF Committee, SFF-8301 Specification for Form Factor of 3.5" Disk Drives Rev 1.6
March 16, 2010

"The pair of bottom mounting holes located by dimension A7 is required. One additional pair of bottom mounting holes are required, either the pair of mounting holes located by dimension A6 or the pair of mounting holes located by dimension A13. Providing all three pairs of mounting holes (located by dimensions A7, A6 and A13) is allowed."

3.5” Disk Drive Dimensions
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