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怎么会是500G

Intel ICH8-M AHCI:

Vendor: Intel
Product: ICH8-M AHCI
Speed: 1.5 Gigabit
Description: AHCI Version 1.10 Supported

WDC WD5000BEVT-22ZAT0:

Capacity: 465.76 GB
Model: WDC WD5000BEVT-22ZAT0
Revision: 01.01A01
Serial Number: WD-WXNY08LW7846
Native Command Queuing: Yes
Queue Depth: 32
Removable Media: No
Detachable Drive: No
BSD Name: disk0
Mac OS 9 Drivers: No
Partition Map Type: GPT (GUID Partition Table)
S.M.A.R.T. status: Verified
Volumes:
SUN:
Capacity: 465.44 GB
Available: 268.88 GB
Writable: Yes
File System: Journaled HFS+
BSD Name: disk0s2
Mount Point: /