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A mounting apparatus includes a chassis, an expansion member attached to a first end of the expansion card and a mounting tray. The chassis includes a front plate and a rear plate opposite to the front plate. The expansion member is engaged with the rear plate. The mounting tray includes a first sec

A mounting apparatus includes a chassis, an expansion member attached to a first end of the expansion card and a mounting tray. The chassis includes a front plate and a rear plate opposite to the front plate. The expansion member is engaged with the rear plate. The mounting tray includes a first section and a second section connected to the first section. A retaining slot is defined in the first section. An engaging portion is disposed on the second section, and a positioning slot defined in the engaging portion. The positioning slot and the retaining slot are located in a longitudinal line. The first section is engaged with the front plate, and the retaining slot and the positioning slot receive a second end of the expansion card.

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1. A mounting apparatus comprising: a chassis comprising a front plate and a rear plate opposite to the front plate;an expansion member attached to a first end of an expansion card, the expansion member engaged with the rear plate; anda mounting tray comprising a first section engaged with the front

1. A mounting apparatus comprising: a chassis comprising a front plate and a rear plate opposite to the front plate;an expansion member attached to a first end of an expansion card, the expansion member engaged with the rear plate; anda mounting tray comprising a first section engaged with the front plate and a second section connected to the first section, the second section comprising a sidewall; a retaining slot defined in the first section, an engaging portion disposed on the second section, the engaging portion comprising two parallel stopper boards that are substantially parallel to the sidewall; the two parallel stopper boards cooperatively defining a positioning slot; the positioning slot and the retaining slot located in a longitudinal line and configured for receiving a second end of the expansion card; a slant block located in the positioning slot and configured for preventing the expansion card from disengaging from the positioning slot. 2. The mounting apparatus of claim 1, wherein each stopper board comprises a diagonal portion and a vertical portion connected to the diagonal portion, and the vertical portion has a length smaller than that of the diagonal portion. 3. The mounting apparatus of claim 2, wherein a slant block is located adjacent to the diagonal portion, and the slant block is elastic. 4. The mounting apparatus of claim 3, wherein the first section comprises a top wall, the slant block is connected to the top wall, and a first strengthening rib is connected to the top wall and the slant block. 5. The mounting apparatus of claim 4, wherein an edge of the first strengthening rib is arc-shaped. 6. The mounting apparatus of claim 1, wherein an edgefold extends from the rear plate, a flange disposed on the expansion member, and the flange is attached to the edgefold. 7. The mounting apparatus of claim 1, wherein the second section comprises a base, a first retaining panel and a second retaining panel are located on the base, and the retaining slot is located between the first retaining panel and the second retaining panel. 8. The mounting apparatus of claim 7, wherein the first retaining panel and the second retaining panel are substantially parallel to each other and perpendicular to the base. 9. The mounting apparatus of claim 1, wherein the second section comprises a top panel and a bottom panel; a first clasping portion and a second clasping portion extend from the top panel, configured to engaged into a first clipping hole and a second clipping hole defined in the front plate; and a third clasping portion extends from the bottom panel, configured to engaged into a third clipping hole defined in the front plate. 10. A mounting apparatus comprising: a chassis comprising a front plate and a rear plate opposite to the front plate;an expansion member attached to a first end of an expansion card, the expansion member engaged with the rear plate; anda mounting tray comprising a first section and a second section connected to the first section, a retaining slot defined in the first section, a slant block protruding from the second section and located in a longitudinal line with the retaining slot; the second section comprising an engaging portion; the engaging portion comprises two stopper boards; and each stopper board comprises a diagonal potion and a vertical portion connected to the diagonal portion;wherein the first section is engaged with the front plate, and the retaining slot is configured for receiving a second opposite end of the expansion card. 11. The mounting apparatus of claim 10, wherein the two stopper boards are substantially parallel to each other; a positioning slot is located between the two stopper boards, and the slant block is received in the positioning slot. 12. The mounting apparatus of claim 10, wherein the vertical portion has a length smaller than that of the diagonal portion. 13. The mounting apparatus of claim 10, wherein the first section comprising a top wall, the slant block is connected to the top wall, and a first strengthening rib is connected to the top wall and the slant block. 14. The mounting apparatus of claim 13, wherein an edge of the first strengthening rib is arc-shaped. 15. The mounting apparatus of claim 10, wherein an edgefold extends from the rear plate, a flange disposed on the expansion member, and the flange is attached to the edgefold. 16. The mounting apparatus of claim 10, wherein the second section comprises a base, a first retaining panel and a second retaining panel are located on the base, and the retaining slot is located between the first retaining panel and the second retaining panel. 17. The mounting apparatus of claim 16, wherein the first retaining panel and the second retaining panel are substantially parallel to each other, and perpendicular to the base. 18. The mounting apparatus of claim 10, wherein the second section comprises a top panel and a bottom panel; a first clasping portion and a second clasping portion extend from the top panel, configured to engaged into a first clipping hole and a second clipping hole defined in the front plate; and a third clasping portion extends from the bottom panel, configured to engaged into a third clipping hole defined in the front plate.